JP2019011572A - Work machine - Google Patents

Abstract

To provide a work machine capable of securely closing a bonnet even with a dimension error or an assembly error.SOLUTION: A work machine comprises: an airframe; a bonnet provide to the airframe so as to open and close; an engaging piece provided in the bonnet; and a receiving component provided in the airframe and including an engaged portion with which the engaging piece engages when the bonnet is closed. The receiving component includes: a first receiving component fixed to the airframe and a second receiving component including the engaged portion and connected with the first receiving component. At least one of the first receiving component and the second receiving component includes an adjusting portion capable of adjusting a relative position of the first receiving component and the second receiving component.SELECTED DRAWING: Figure 26

Description

  The present invention relates to a working machine such as a backhoe.

Conventionally, a working machine (backhoe) disclosed in Patent Document 1 is known.
The work machine disclosed in Patent Literature 1 includes a machine body (swivel base) and a bonnet (rear cover) provided to be openable and closable with respect to the machine body. A support frame is erected on the rear part of the machine body, and a locking member is provided on the right rear part of the support frame. On the right side of the bonnet, a locked tool that is locked by the locking member when the hood is closed is provided.

JP 2009-243070 A

According to the working machine disclosed in Patent Document 1, the bonnet can be closed by locking the locked tool with respect to the locking member. However, Patent Document 1 does not disclose a structure for surely closing the bonnet even when the bonnet or the like has a dimensional error or an assembly error.
Therefore, an object of the present invention is to provide a work machine that can reliably close a bonnet even when the bonnet or the like has a dimensional error or an assembly error.

  A work machine according to an aspect of the present invention includes an airframe, a bonnet provided to be openable / closable with respect to the airframe, a locking piece provided on the bonnet, and provided on the airframe and closing the bonnet. A receiving member having a locking portion to which the locking piece is sometimes locked, the receiving member having a first receiving member fixed to the body, the locking portion, and the first A second receiving member connected to the first receiving member, wherein at least one of the first receiving member and the second receiving member is capable of adjusting a relative position between the first receiving member and the second receiving member. It has the adjustment part to do.

  According to the above working machine, even when there is a dimensional error or assembly error in the bonnet or the like, the bonnet can be reliably closed.

It is a perspective view of a working device. It is a perspective view of a boom. It is a partial notch perspective view which shows the reinforcement structure inside a boom. It is a longitudinal cross-sectional view which shows the reinforcement structure inside a boom. FIG. 4 is an enlarged view of the vicinity of a front reinforcing plate in FIG. 3. FIG. 4 is an enlarged view of the vicinity of a rear reinforcing plate in FIG. 3. It is a longitudinal cross-sectional view which shows the example of a change of a reinforcement board. It is a longitudinal cross-sectional view which shows another example of a change of a reinforcement board. It is an upper perspective view of the front-end | tip part of a boom. It is a downward perspective view of the tip part of a boom. It is a longitudinal cross-sectional view in the body width direction center of the front-end | tip part of a boom. It is a cross-sectional view in the AA position of FIG. It is a perspective view of a boom front-end | tip part and an arm base end part. It is the perspective view which looked at the body from the right front. It is a perspective view which shows arrangement | positioning, such as a control valve, a switching valve, and a spindle. FIG. 16 is a partially enlarged view of FIG. 15. It is a perspective view of a supporting member. It is a disassembled perspective view of a support member. It is a top view which shows the effect | action of a position adjustment part. It is a top view which shows the effect | action of a 2nd position adjustment part. It is the perspective view which looked at the state which closed the bonnet from diagonally back. It is the perspective view which looked at the state which closed the bonnet from diagonally forward. It is the perspective view which showed the bonnet etc. in the imaginary line in FIG. It is a top view which shows the state which closed the bonnet. It is a top view which shows the state which opened the bonnet. It is a perspective view which shows a locking piece and a receiving member. It is a perspective view which shows the state which made the latching piece latch with respect to the latching shaft, and the state made to detach | leave. It is a top view which shows the state which made the latching piece latch with respect to the latching shaft, and the state made to detach | leave. It is the disassembled perspective view which looked at the receiving member from the left front. It is the perspective view which looked at the receiving member from the right rear. It is a top view which shows the latching member and receiving member of the state which has opened the bonnet. It is a figure explaining the method of position adjustment by an adjustment part. It is the side view which looked at the motor | power_engine from the output-shaft (crankshaft) side. It is the top view which looked at the motor | power_engine from the upper direction. It is the perspective view which looked at the belt tension adjusting device from the output shaft side of the prime mover. It is a perspective view of a bracket, a rotation operation mechanism, and a rotation member. It is the perspective view which looked at the belt tension adjusting device from the opposite side to the output shaft of the prime mover. It is a figure which shows the effect | action of a belt tension adjustment apparatus from the output-shaft side of a motor | power_engine. It is a figure which shows the effect | action of a belt tension adjustment apparatus from the output shaft side of a motor | power_engine. It is a top view of a working machine. It is a side view of a working machine.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
<Overall configuration of work equipment>
First, the overall configuration of the work machine 1 will be described.
40 and 41 are schematic views showing the working machine 1 according to the present invention, and illustrate a backhoe that is a turning work machine.

  The work machine 1 includes a machine body (swivel base) 2, a cabin 3, a traveling device 4, and a work device 5. Hereinafter, in the embodiment of the present invention, the front side (left side in FIG. 41) of the driver seated on the driver's seat 6 of the work machine 1 is the front, the rear side of the driver (right side in FIG. 41) is the back, and the left side of the driver The description will be given with the left side (front side in FIG. 41) as the left side and the right side (back side in FIG. 41) of the driver as the right side. Further, the horizontal direction K2 (see FIG. 40), which is a direction orthogonal to the front-rear direction K1 (see FIG. 41), will be described as the body width direction. In addition, the direction from the central part of the airframe 2 toward the right part or the left part will be described as the outside of the airframe. In other words, the outward direction of the airframe is the direction of the airframe width K2 and away from the center of the airframe 2 in the width direction. The direction opposite to the outside of the aircraft will be described as the inside of the aircraft. In other words, the in-machine direction is the direction of the machine body width direction K2 and approaching the center of the machine body 2 in the width direction.

The body 2 is supported above the traveling device 4 so as to be able to turn. The airframe 2 has a turning substrate 11 and a weight 12. The turning board 11 is supported on the frame of the traveling device 4 via a turning bearing, and turns around the vertical axis (vertical axis) by driving the turning motor. The weight 12 is attached to the rear part of the airframe 2.
The cabin 3 is mounted on the left side and the front side of the body 2. A driver seat 6 is provided inside the cabin 3.

  At the rear of the machine body 2, a prime mover 13, a hydraulic pump 14, a fan 23, an alternator 24, a compressor 25, a radiator 46 and the like are arranged. In the present embodiment, the prime mover 13 is an engine, and in this embodiment is a diesel engine. The prime mover 13 may be an engine different from a diesel engine such as a gasoline engine, or may be an electric motor. The prime mover 13 is provided with an output shaft (crankshaft, power transmission shaft) directed in the body width direction (left side). The hydraulic pump 14 is disposed on the left side of the prime mover 13. The fan 23 is disposed on the right side of the prime mover 13. The alternator 24 is disposed above the right front portion of the prime mover 13 and outputs DC power for storing in the battery. The compressor 25 is disposed above the left front portion of the prime mover 13 and compresses the refrigerant of the air conditioner that cools the cabin 3. The radiator 46 is disposed on the right side of the fan 23 and is cooled by driving the fan 23. The hydraulic pump 14, the fan 23, the alternator 24, and the compressor 25 are driven by the power of the prime mover 13.

  A hydraulic oil tank 15, a control valve 26, and a battery (not shown) are disposed on the right side of the machine body 2. The hydraulic oil tank 15 stores hydraulic oil for operating hydraulic equipment (such as a hydraulic cylinder described later) provided in the machine body 2. The hydraulic oil stored in the hydraulic oil tank 15 is fed by driving the hydraulic pump 14. The control valve 26 controls the supply of hydraulic oil to the hydraulic equipment.

The traveling device 4 is a crawler-type traveling device, and is provided below the right side and the left side of the body 2. A dozer device 16 is provided at the front of the traveling device 4. The dozer device 16 is driven by a dozer cylinder 37.
A support bracket 17 is provided at the front of the machine body 2. A swing bracket 18 is pivotally supported on the support bracket 17. The swing bracket 18 can swing around the vertical axis by driving a swing cylinder 19 mounted on the revolving substrate 11. The working device 5 is attached to the swing bracket 19.

  As shown in FIG. 41, the work device 5 includes a boom 8, an arm 9, and a work tool 10. In the present embodiment, a bucket is mounted as the work tool 10, but another work tool (hydraulic attachment) can be mounted instead of or in addition to the bucket. Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle bloom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

Further, the work device 5 includes a boom cylinder 20, an arm cylinder 21, and a work tool cylinder 22 as drive mechanisms (hydraulic actuators) such as the boom 8. The boom cylinder 20, the arm cylinder 21, the work tool cylinder 22, the swing cylinder 19, and the dozer cylinder 37 are configured by hydraulic cylinders.
The base end portion of the boom 8 is pivotally supported by the swing bracket 18 via the first horizontal shaft 31. The boom 8 swings up and down around the first horizontal axis 31 by the expansion and contraction of the boom cylinder 20. The base end portion of the arm 9 is pivotally supported by the distal end portion of the boom 8 via a second horizontal axis (pivot support shaft) 32. The arm 9 swings up and down around the second horizontal axis 32 due to the expansion and contraction of the arm cylinder 21.

  The work tool 10 is attached to the tip of the arm 9 via the third horizontal shaft 33 and the bracket 50. One end of the first link 48 is pivotally supported on the bracket 50 via the fourth horizontal shaft 34. One end of the second link 49 is pivotally supported on the other end of the first link 48 via a fifth horizontal shaft 35. The other end of the second link 49 is pivotally supported via the sixth horizontal shaft 36 in the vicinity of the distal end of the arm 9 and closer to the base end side than the third horizontal shaft 33. A tip end portion of the work tool cylinder 22 is pivotally supported on the fifth horizontal shaft 35. The proximal end portion of the work tool cylinder 22 is pivotally supported by a third pivotal support member 29 described later provided on the proximal end side of the arm 9. The work tool 10 performs a squeeze / dump operation by the expansion and contraction of the work tool cylinder 22.

<Boom overall configuration>
Next, the overall configuration of the boom 8 will be described.
As shown in FIGS. 1 to 3, the boom 8 has a boom body 81 and a shaft support portion 82.
The boom body 81 is bent so as to protrude upward in the middle of the length direction (direction from the base end side toward the tip end side). That is, the boom main body 81 has the bent part 81a in the middle part in the length direction. The boom body 81 is formed in a substantially rectangular tube shape, and includes a first vertical plate 8a, a second vertical plate 8b, a first horizontal plate 8c, and a second horizontal plate 8d.

  The first vertical plate 8a is located on one side in the body width direction. The second vertical plate 8b is located on the other side in the body width direction. The first horizontal plate 8c connects the first vertical plate 8a and the second vertical plate 8b on one end side in the vertical direction. The second horizontal plate 8d connects the first vertical plate 8a and the second vertical plate 8b on the other end side in the vertical direction. In this embodiment, the first vertical plate 8a is a right plate, the second vertical plate 8b is a left plate, the first horizontal plate 8c is a lower plate, and the second horizontal plate 8d is an upper plate. Note that the direction of the boom 8 is based on a state where the boom 8 shown in FIGS. 40 and 41 is not swinging (a state where the boom 8 extends in the front-rear direction).

As shown in FIGS. 1 and 2, the shaft support portion 82 includes a front shaft support portion 83 and a rear shaft support portion 84. As shown in FIGS. 1 and 41, the base end portion of the arm 9 is pivotally supported on the front shaft support portion 83 via the second horizontal shaft (pivot shaft) 32. The rear shaft support portion 84 is pivotally supported by the swing bracket 18 via the first horizontal shaft 31.
The front shaft support portion 83 and the rear shaft support portion 84 are made of, for example, cast steel. The front shaft support 83 is located at the tip (front end) of the boom 8. Specifically, the front shaft support portion 83 is fitted into the distal end portion of the boom body 81 and fixed by welding. The rear shaft support portion 84 is located at the base end (rear end) of the boom 8. Specifically, the rear shaft support portion 84 is fitted into the base end portion of the boom body 81 and is fixed by welding.

As shown in FIGS. 1 to 3, the boom 8 is provided with a first pivot member 27 and a second pivot member 28.
The first pivotal support member 27 is fixed to the outer surface (lower surface) of the first horizontal plate 8 c in the middle of the boom body 81 in the length direction. Specifically, the first pivotal support member 27 is fixed to the lower surface of the first horizontal plate 8 c in the bent portion 81 a of the boom body 81.

As shown in FIGS. 1 and 41, one end portion (tip portion) of the boom cylinder 20 is pivotally supported on the first pivot support member 27 via a pivot shaft (first pivot shaft) 51. The other end (base end) of the boom cylinder 20 is pivotally supported by the swing bracket 18 via a pivot (second pivot) 52.
As shown in FIG. 2, the first pivot member 27 has a right plate 27R and a left plate 27L. The right plate 27R and the left plate 27L are arranged to face each other with an interval in the body width direction. Each of the right plate 27R and the left plate 27L is provided with a pivot (boss) 271. The pivot 271 supports both ends of the first pivot 51. Accordingly, one end portion (tip portion) of the boom cylinder 20 is pivotally supported on the pivot support portion 271 via the first pivot shaft 51.

The second pivot member 28 is fixed to the outer surface (upper surface) of the second horizontal plate 8d in the middle of the boom body 81 in the length direction. Specifically, the second pivot member 28 is fixed to the upper surface of the second horizontal plate 8d in front of the bent portion 81a of the boom body 81. One end (base end) of the arm cylinder 21 is pivotally supported on the second pivot member 28 via a pivot (third pivot) 53.
The second pivot member 28 has a right plate 28R and a left plate 28L. The right plate 28R and the left plate 28L are arranged to face each other with an interval in the body width direction. A second pivot (boss) 281 is provided on each of the right plate 28R and the left plate 28L. The second pivot 281 supports both ends of the third pivot 53. Accordingly, one end portion (base end portion) of the arm cylinder 21 is pivotally supported on the second pivotal support portion 281 via the third pivotal shaft 53.

  As shown in FIG. 1, a plurality of oil feed pipes are fixed to the boom 8 along the length direction of the boom 8. In the present embodiment, a first oil feed pipe 56 and a second oil feed pipe 57 are provided as a plurality of oil feed pipes. The first oil feed pipe 56 is a feed pipe through which hydraulic oil to be sent to the work tool cylinder 22 is passed and a return pipe through which hydraulic oil returning from the work tool cylinder 22 is passed. The first oil feed pipe 56 is extended along the upper surface of the boom body 81. The second oil feed pipe 57 is a feed pipe through which hydraulic oil sent to the port 40 passes and a return pipe through which hydraulic oil returning from the port 40 passes. The port 40 is a so-called service port, and can be connected to a hydraulic hose that supplies hydraulic oil to the hydraulic actuator that drives the other working tools described above.

  One end of a hydraulic hose (first hydraulic hose) 38 is connected to the tip of the first oil feed pipe 56. One end of another hydraulic hose (second hydraulic hose) 39 is connected to the tip of the second oil feed pipe 57. The first hydraulic hose 38 and the second hydraulic hose 39 are extended from the proximal end side of the boom 8 to the distal end side. The other end of the first hydraulic hose 38 is connected to the work tool cylinder 22. The other end of the second hydraulic hose 39 is connected to the service port 40.

  A third pivot member 29 is provided on the proximal end side of the arm 9. A pivot (fourth pivot) 54 is supported at the rear of the third pivot member 29. On the fourth pivot 54, the other end portion (tip portion) of the arm cylinder 21 is pivotally supported. A pivot (fifth pivot) 55 is supported on the front portion of the third pivot member 29. One end (base end) of the work tool cylinder 22 is pivotally supported on the fifth pivot 55.

  The third pivot member 29 has a right plate 29R and a left plate 29L. The right plate 29R and the left plate 29L are arranged to face each other with an interval in the body width direction. The right plate 29R supports one side (right side) of the fourth pivot 54 and one side (right side) of the fifth pivot 55. The left plate 29L supports the other side (left side) of the fourth pivot 54 and the other side (left side) of the fifth pivot 55.

<Reinforcement structure inside the boom>
Next, the reinforcement structure inside the boom 8 will be described. In the following description of the reinforcing structure, for the sake of convenience, the boom cylinder 20 is referred to as a first hydraulic cylinder, and the arm cylinder 21 is referred to as a second hydraulic cylinder. However, as shown in a modification example to be described later, the arm cylinder 21 may be a first hydraulic cylinder and the boom cylinder 20 may be a second hydraulic cylinder.
As shown in FIGS. 3 to 6, the boom 8 is provided with a reinforcing plate 60. The reinforcing plate 60 includes a front reinforcing plate 60A and a rear reinforcing plate 60B.
First, the front reinforcing plate 60A will be described with reference to FIGS.
The front reinforcing plate 60A is provided inside the boom main body 81 at a position closer to the front of the boom main body 81 (in front of the bent portion 81a). As shown in FIG. 4, the front reinforcing plate 60 </ b> A is provided at a position ahead of the first pivot 51 and the third pivot 53 (the tip end side of the boom 8).

The front reinforcing plate 60A includes a first support portion 61A, a second support portion 62A, a first bent portion 63A, a second bent portion 64A, and a connecting portion 65A. The first support portion 61A, the second support portion 62A, the first bent portion 63A, the second bent portion 64A, and the connecting portion 65A are integrally formed by bending a single metal plate.
61 A of 1st support parts are plate shape, Comprising: One surface (lower surface) is contact | abutted to the inner surface (upper surface) of the 1st horizontal plate 8c. The second support portion 62A is plate-shaped, and one surface (upper surface) is in contact with the inner surface (lower surface) of the second horizontal plate 8d.

  Either or either one of the first support portion 61A and the second support portion 62A is fixed to the inner surface of the boom body 81 (the upper surface of the first horizontal plate 8c and / or the lower surface of the second horizontal plate 8d) by welding or the like. Yes. For example, the first support portion 61A has a first vertical plate 8a, a second vertical plate 8b, and a first horizontal plate (lower plate) on substantially the entire circumference (including the first bent portion 63A) of the first support portion 61A. It is welded to the inner surface of 8c. The second support portion 62A is welded to the inner surfaces of the first vertical plate 8a and the second vertical plate 8b, but is not welded to the inner surface of the second horizontal plate (upper plate) 8d. However, the welding location of the first support portion 61A and the second support portion 62A is not limited to this example.

The width (length in the body width direction) of the first support portion 61A is set to be equal to or greater than the distance between the outer surface (left surface) of the right plate 27R of the first pivotal support member 27 and the outer surface (right surface) of the left plate 27L. ing. The width (length in the body width direction) of the second support portion 62A is set to be equal to or greater than the distance between the outer surface (left surface) of the right plate 28R of the second pivot member 28 and the outer surface (right surface) of the left plate 28L. ing.
The first bent portion 63A is bent from the first support portion 61A toward the second horizontal plate 8d side. 63 A of 1st bending parts are adjoining to the inner surface of the 1st horizontal board 8c in the position which overlaps with the 1st pivot member 27 on both sides of the 1st horizontal board 8c. Specifically, as shown in FIG. 4, the first bent portion 63 </ b> A is between the end portion (front end portion) 27 a of the first pivot support member 27 in the boom length direction and the pivot support portion 271 and is the first horizontal plate. It is close to the inner surface (upper surface) of the first horizontal plate 8c at a position overlapping the front portion of the first pivotal support member 27 with 8c interposed therebetween.

  The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the pivot support portion 271 (a direction away from the first pivot shaft 51). The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the second pivotally supported portion 281 (a direction away from the third pivot 53). Yes. Specifically, the first support portion 61A extends from the first bent portion 63A to the front (the tip side of the boom 8) along the upper surface of the first horizontal plate 8c.

  As shown in FIG. 5, the first support portion 61A has a different extension length from the first bent portion 63A in the machine body width direction. Specifically, portions (maximum extending portions) 61a having the maximum extending length from the first bent portion 63A are provided on one side and the other side in the body width direction, respectively, and the first bent portion 63A. A portion (minimum extension portion) 61b having the minimum extension length from the center is provided at the center in the body width direction. A space between the extended end of the maximum extending portion 61a and the extended end of the minimum extending portion 61b is formed in an arc shape. The maximum extending portion 61a is in contact with the inner surface of the first horizontal plate 8c at a position overlapping the left plate 27L and the right plate 27R via the first horizontal plate 8a. The minimum extending portion 61b is in contact with the inner surface of the first horizontal plate 8c at a position between the left plate 27L and the right plate 27R.

  The front end of the first support portion 61 </ b> A (the extended end of the maximum extending portion 61 a) is located in front of the front end 27 a of the first pivotal support member 27. The rear end of the first support portion 61 </ b> A (boundary portion with the first bent portion 63 </ b> A) is located behind the front end 27 a of the first pivotal support member 27. That is, the front end 27a of the first pivotal support member 27 is located between the front end and the rear end of the first support portion 61A in the front-rear direction.

The second bent portion 64A is bent from the second support portion 62A toward the first horizontal plate 8c. The second bent portion 64A is close to the inner surface of the second horizontal plate 8d at a position overlapping the front portion of the second pivot member 28 via the second horizontal plate 8d.
As shown in FIG. 4, the second support portion 62A extends from the second bent portion 64A along the inner surface of the second horizontal plate 8d in a direction away from the pivot portion 271 (a direction away from the first pivot axis 51). It is installed. The second support portion 62A extends from the second bent portion 64A along the inner surface of the second horizontal plate 8d in a direction away from the second pivotal portion 281 (a direction away from the third pivot 53). Yes. Specifically, the second support portion 62A extends forward (from the tip side of the boom 8) along the lower surface of the second horizontal plate 8d from the second bent portion 64A.

  As shown in FIG. 5, the extension length of the second support portion 62A from the second bent portion 64A is different in the body width direction. Specifically, portions (maximum extending portions) 62a having the maximum extending length from the second bent portion 64A are provided on one side and the other side in the body width direction, respectively, and the second bent portion 64A. A portion (minimum extension portion) 62b having the minimum extension length from the center is provided at the center in the body width direction. A space between the extended end of the maximum extending portion 62a and the extended end of the minimum extending portion 62b is formed in an arc shape. The maximum extending portion 62a supports the inner surface of the second horizontal plate 8d at a position overlapping the left plate 28L and the right plate 28R via the second horizontal plate 8d. The minimum extending portion 62b is in contact with the inner surface of the second horizontal plate 8d at a position between the left plate 28L and the right plate 28R.

The front end of the second support portion 62A (the extended end of the maximum extending portion 62a) is located in front of the front end 28a of the second pivot member 28. The rear end of the second support portion 62A (the boundary portion with the second bent portion 64A) is located behind the front end 28a of the second pivot member 28. That is, the front end of the second pivot member 28 is located between the front end and the rear end of the second support portion 62A in the front-rear direction.
The connecting portion 65A connects the first bent portion 63A and the second bent portion 64A. 65 A of connecting parts incline so that it may move to the front (front end side of the boom 8) as it goes to the 2nd support part 62A from the 1st support part 61A.

One of the first bent portion 63A and the second bent portion 64A is bent at an acute angle, and the other is bent at an obtuse angle. In the present embodiment, the first bent portion 63A is bent at an acute angle, and the second bent portion 64A is bent at an obtuse angle.
Next, the rear reinforcing plate 60B will be described based on FIG. 3, FIG. 4, and FIG.
The rear reinforcing plate 60B is provided inside the boom main body 81 at a position closer to the rear of the boom main body 81 (behind the bent portion 81a). As shown in FIG. 4, the rear reinforcing plate 60 </ b> B is provided at a position behind the first pivot 51 and the third pivot 53 (on the base end side of the boom 8).

The rear reinforcing plate 60B includes a first support portion 61B, a second support portion 62B, a first bent portion 63B, a second bent portion 64B, and a connecting portion 65B. The first support portion 61B, the second support portion 62B, the first bent portion 63B, the second bent portion 64B, and the connecting portion 65B are integrally formed by bending a single metal plate.
The first support portion 61B is plate-shaped, and one surface (lower surface) is in contact with the inner surface (upper surface) of the first horizontal plate 8c. The second support portion 62B has a plate shape, and one surface (upper surface) is in contact with the inner surface (lower surface) of the second horizontal plate 8d.

Either or either one of the first support portion 61B and the second support portion 62B is fixed to the inner surface of the boom body 81 (the upper surface of the first horizontal plate 8c and / or the lower surface of the second horizontal plate 8d) by welding or the like. Yes.
The first bent portion 63B is bent from the first support portion 61B toward the second horizontal plate 8d. The first bent portion 63B is close to the inner surface of the first horizontal plate 8c at a position overlapping the rear portion of the first pivotal support member 27 via the first horizontal plate 8a.

As shown in FIG. 4, the first support portion 61B extends from the first bent portion 63B along the inner surface of the first horizontal plate 8c in a direction away from the pivot portion 271 (a direction away from the first pivot axis 51). It is installed. Specifically, the first support portion 61B extends rearward (base end side of the boom 8) along the upper surface of the first horizontal plate 8c from the first bent portion 63B.
As shown in FIG. 6, the extended length from the 1st bending part 63B differs in the 1st support part 61B in the body width direction. Specifically, portions (maximum extending portions) 61c having the maximum extending length from the first bent portion 63B are provided on one side and the other side in the body width direction, respectively, and the first bent portion 63B. A portion (minimum extension portion) 61d having a minimum extension length from the center is provided at the center in the body width direction. A space between the extended end of the maximum extending portion 61c and the extended end of the minimum extending portion 61d is formed in an arc shape. The maximum extending portion 61c is in contact with the inner surface of the first horizontal plate 8c at a position overlapping the left plate 27L and the right plate 27R via the first horizontal plate 8c. The minimum extending portion 61d is in contact with the inner surface of the first horizontal plate 8c at a position between the left plate 27L and the right plate 27R.

  The rear end of the first support portion 61B (the extended end of the maximum extending portion 61a) is located behind the rear end 27b of the first pivotal support member 27. The front end of the first support portion 61B (the boundary portion with the first bent portion 63B) is located in front of the rear end 27b of the first pivot member 27. That is, the rear end 27b of the first pivot member 27 is located between the front end and the rear end of the first support portion 61B in the front-rear direction.

The second bent portion 64B is bent from the second support portion 62B toward the first horizontal plate 8c side. The second bent portion 64A is close to the inner surface of the second horizontal plate 8d.
The second support portion 62B extends from the second bent portion 64B along the inner surface of the second horizontal plate 8d in a direction away from the pivot support portion 271 (a direction away from the first pivot shaft 51). Specifically, the second support portion 62B extends rearward (base end side of the boom 8) from the second bent portion 64B along the lower surface of the second horizontal plate 8d.

  As shown in FIG. 6, the extension length from the second bent portion 64B of the second support portion 62B is different in the body width direction. Specifically, portions (maximum extending portions) 62c having the maximum extending length from the second bent portion 64B are provided on one side and the other side in the body width direction, respectively, and the second bent portion 64B. 62d (minimum extension part) 62d where the extension length from the minimum is provided at the center in the body width direction. A space between the extended end of the maximum extending portion 62c and the extended end of the minimum extending portion 62d is formed in an arc shape.

  The connecting portion 65B connects the first bent portion 63B and the second bent portion 64B. The connecting portion 65B is inclined so as to move rearward (the base end side of the boom 8) from the first support portion 61B toward the second support portion 62B. Accordingly, the connecting portion 65A is inclined so as to move forward as it goes from the first support portion 61A to the second support portion 62A, and the connecting portion 65B is moved from the first support portion 61B to the second support portion 62B. It becomes the structure which inclines so that it may transfer to back. Therefore, the entire bending deformation of the boom 8 can be effectively prevented by the front reinforcing plate 60A arranged in front of the bent portion 81a and the rear reinforcing plate 60B arranged behind the bent portion 81a.

  One of the first bent portion 63B and the second bent portion 64B is bent at an acute angle, and the other is bent at an obtuse angle. In the present embodiment, the first bent portion 63B is bent at an acute angle, and the second bent portion 64B is bent at an obtuse angle. Thereby, since the intensity | strength of the reinforcement board 60 improves significantly in the 1st bending part 63A, the reinforcement effect can be heightened. Further, since one of the first bent portion 63A and the second bent portion 64A is bent at an acute angle and the other is bent at an obtuse angle, the first pivot member 27 and the second pivot member 28 are connected to the boom. Even when separated in the length direction, the first lateral plate 8c and the second lateral plate 8d can be effectively reinforced by the single reinforcing plate 60.

  In the above-described embodiment, the first horizontal plate 8c is the lower plate and the second horizontal plate 8d is the upper plate. However, the first horizontal plate 8c is the upper plate and the second horizontal plate 8d is the lower plate. It may be. In this case, the pivot member fixed to the outer surface (upper surface) of the upper plate is the first pivot member 27, and the pivot member fixed to the outer surface (lower surface) of the lower plate is the second pivot member 28. Further, the arm cylinder 21 becomes a first hydraulic cylinder, and the boom cylinder 20 becomes a second hydraulic cylinder. The reinforcing plate 60 has a configuration in which the first support portion 61A abuts on the inner surface of the upper plate and the second support portion 62A abuts on the inner surface of the lower plate.

  In the embodiment described above, the reinforcing plate 60 (the front reinforcing plate 60A and the rear reinforcing plate 60B) includes the first support portion 61A, the second support portion 62A, the first bent portion 63B, the second bent portion 64B, Although it has the connection part 65B, the reinforcement board 60 should just have the 1st support part 61A and the 1st bending part 63B. That is, the reinforcing plate 60 may be a plate bent in a substantially L shape. Hereinafter, a modified example in the case where the front reinforcing plate 60A is a plate bent in a substantially L shape will be described. The description of the rear reinforcing plate 60B is omitted, but a modified example similar to that of the front reinforcing plate 60A can be adopted.

7 and 8 show a modification example in the case where the front reinforcing plate 60A is a plate bent in a substantially L shape. The front reinforcing plate 60A in these modified examples includes a first support portion 61A, a first bent portion 63A, and a first extending portion 66A.
In the modification shown in FIG. 7 (first modification), the first horizontal plate 8c is the lower plate and the second horizontal plate 8d is the upper plate. In the first modification, the first support portion 61A is in contact with the inner surface (upper surface) of the first horizontal plate (lower plate) 8c. The first support portion 61A is fixed to the inner surface of the first horizontal plate 8c by welding or the like. The first bent portion 63A is bent from the first support portion 61A toward the second horizontal plate (upper plate) 8d and overlaps the front portion of the first pivot member 27 via the first horizontal plate 8c. It is close to the inner surface of the first horizontal plate 8c. The first bent portion 63A is bent at an acute angle. The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the pivot support portion 271 (a direction away from the first pivot shaft 51). The first extending portion 66A extends from the first bent portion 63A toward the second horizontal plate 8d and contacts the inner surface (lower surface) of the second horizontal plate 8d. The first extending portion 66A may be connected to the inner surface of the second horizontal plate 8d by welding or the like.

  In the modified example (second modified example) shown in FIG. 8, the first horizontal plate 8c is an upper plate and the second horizontal plate 8d is a lower plate. Further, the pivot member fixed to the outer surface (upper surface) of the first horizontal plate 8c is the first pivot member 27, and the pivot member fixed to the outer surface (lower surface) of the second horizontal plate 8d is the second pivot. This is a support member 28. The arm cylinder 21 is a first hydraulic cylinder and the boom cylinder 20 is a second hydraulic cylinder.

  In the second modified example, the first support portion 61A is in contact with the inner surface (lower surface) of the first horizontal plate (upper plate) 8c. The first support portion 61A is fixed to the inner surface of the first horizontal plate 8c by welding or the like. The first bent portion 63A is bent from the first support portion 61A toward the second horizontal plate (lower plate) 8d and overlaps the front portion of the first pivot member 27 via the first horizontal plate 8c. It is close to the inner surface of the first horizontal plate 8c. The first bent portion 63A is bent at an obtuse angle. The first support portion 61A extends from the first bent portion 63A along the inner surface of the first horizontal plate 8c in a direction away from the second pivotal support portion 281 (a direction away from the third pivotal axis 53). The first extending portion 66A extends from the first bent portion 63A toward the second horizontal plate 8d and contacts the inner surface of the second horizontal plate 8d. The first extending portion 66A may be connected to the inner surface of the second horizontal plate 8d by welding or the like.

<Boom tip shape>
Next, the tip shape of the boom 8 will be described with reference to FIGS.
The front shaft support portion 83 provided on the distal end side of the boom 8 includes a first bearing portion 85, a second bearing portion 86, and a connection portion 87.
The first bearing portion 85 extends forward from the tip of the boom body 81 on one side (right side) in the body width direction. The second bearing portion 86 extends forward from the tip of the boom body 81 on the other side (left side) in the body width direction. The first bearing portion 85 supports one end side (right side) of the second horizontal shaft (pivot shaft) 32. The second bearing portion 86 supports the other end side (left side) of the second horizontal shaft 32.

The connection part 87 connects the first bearing part 85 and the second bearing part 86. Specifically, the connecting portion 87 connects the rear portion of the inner surface (left surface) of the first bearing portion 85 and the rear portion of the inner surface (right surface) of the second bearing portion 86. In other words, the first bearing portion 85 and the second bearing portion 86 are bifurcated from the connection portion 87 and extend forward.
As shown in FIGS. 9, 11, and 12, the upper surface 87 a of the connection portion 87 is formed as an inclined surface that moves downward as it goes forward. A first recess 88 that is recessed downward (toward the lower surface 87 b) is formed on the upper surface 87 a of the connection portion 87. In other words, the first recess 88 is formed on the upper surface 87a which is an inclined surface. As shown in FIG. 11, the first recess 88 is recessed in a direction (front-rear direction) from the proximal end side of the boom 8 toward the distal end side. Further, as shown in FIG. 12, the first recess 88 is also recessed in the width direction (machine body width direction) from the first bearing portion 85 toward the second bearing portion 86.

As shown in FIG. 11, since the first recess 88 is provided, the upper surface 87a has a first inclined portion 87f having a larger (steep) inclination in the front-rear direction, and an inclination than the first inclined portion 87f. A small (gradual) second inclined portion 87g is formed. Both the first inclined portion 87f and the second inclined portion 87g are inclined with respect to the extending direction (length direction) of the boom 8.
Also, as shown in FIG. 12, the upper surface 87a has a first curved surface 87h that decreases toward the other side on one side in the width direction of the aircraft, and a second curved surface 87i that decreases toward the other side on the other side. And a flat surface 87j connecting the first curved surface 87e and the second curved surface 87f at the center.

  The first recess 88 is provided with a holding portion 30 that holds the first hydraulic hose 38. As shown in FIGS. 11 and 12, the holding portion 30 is attached to the bottom (the most recessed portion) of the recess of the first recess 88. Specifically, as shown in FIG. 11, the holding portion 30 is attached to a boundary portion between the first inclined portion 87 f and the second inclined portion 87 g in the front-rear direction. Moreover, as shown in FIG. 12, the holding | maintenance part 30 is provided in the flat surface 87j in the body width direction.

  The holding unit 30 includes a substrate 30a and a holding body 30b. The substrate 30a is fixed to the first recess 88 by a fixture (bolt) 30c. As shown in FIGS. 11 to 13, the holding body 30 b holds the first hydraulic hose 38 in the vicinity of the first recess 88 by pressing the first hydraulic hose 38 from above (regulating upward movement). In the case of the present embodiment, the holding unit 30 holds two hydraulic hoses, but may hold three or more hydraulic hoses.

  As shown in FIGS. 10 and 11, the lower surface 87 b of the connecting portion 87 is formed on an inclined surface that is inclined with respect to the extending direction (length direction) of the boom 8. Specifically, the lower surface 87b is formed as an inclined surface that moves upward as it goes forward. The inclined surface is formed with a second recess 89 that is recessed upward (toward the upper surface 87a) in the body width direction. As shown in FIG. 12, by providing the second recess 89, the lower surface 87b has a third curved surface 87k that becomes lower toward the other side in the body width direction, and one side on the other side. It has the 4th curved surface 87m which becomes low as it goes to, and has the flat surface 87n which connects the 3rd curved surface 87k and the 4th curved surface 87m in the center.

  As shown in FIG. 11, the rear end portion 87 c of the inclined surface formed on the upper surface 87 a of the connection portion 87 is located behind the rear end portion 87 d of the inclined surface formed on the lower surface 87 b of the connection portion 87. Yes. In other words, the inclination angle of the upper surface 87a (inclination angle with respect to the upper surface of the boom body 81) is formed more gently than the inclination angle of the lower surface 87b (inclination angle with respect to the lower surface of the boom body 81). However, the inclination angle of the upper surface 87a and the inclination angle of the lower surface 87b may be formed the same.

  As shown in FIG. 11, the connecting portion 87 extends forward near the middle in the vertical direction between the first bearing portion 85 and the second bearing portion 86. The front end 87e of the connecting portion 87 is positioned below a first straight line (virtual straight line) L1 that connects the upper end of the second horizontal axis (pivot support shaft) 32 and the midpoint 81M in the vertical direction of the rear end of the front shaft support portion 83. doing. Further, the front end 87e of the connecting portion 87 is located above a second straight line (virtual straight line) L2 connecting the lower end of the second horizontal axis 32 and the midpoint 81M. Further, the front end 87e of the connecting portion 87 is located below a third straight line (virtual straight line) L3 that connects the axial center 32C of the second horizontal shaft 32 and the vertical middle point 81M of the rear end of the front shaft support portion 83. ing. However, the front end 87e of the connecting portion 87 may be located on the third straight line L3, not below the third straight line L3, or may be located above the third straight line L3.

  As shown in FIGS. 11 and 13, the first hydraulic hose 38 extending forward along the upper surface of the boom body 81 (the upper surface of the second horizontal plate 8 d) is held by the holding unit 30. Then, it is guided forward and downward (obliquely forward and downward) along the upper surface 87a of the connecting portion 87. The first hydraulic hose 38 guided along the upper surface 87a of the connection portion 87 passes between the front end 87e of the connection portion 87 and the second horizontal shaft 32, and the left plate 29L and the right plate of the third pivot member 29. After being guided to 29R, the work tool cylinder 22 is connected.

  In the case of the present embodiment, the first hydraulic hose 38 is guided along the upper surface 87a of the connection portion 87, but a sufficient space is secured above the connection portion 87 by the first recess 88. In addition to the first hydraulic hose 38, the second hydraulic hose 39 can be guided along the upper surface 87a. That is, the second hydraulic hose 39 can be routed through the outside of the front shaft support portion 83 (outside the machine body) (see FIG. 1), or routed along the upper surface 87a of the connection portion 87. You can also. Further, in the present embodiment, the connecting portion 87 has a recess on both the upper surface 87a and the lower surface 87b, but it is only necessary to have a recess on at least one surface of the upper surface 87a and the lower surface 87b. That is, it is good also as a structure which has a recessed part only in the upper surface 87a, or a structure which has a recessed part only in the lower surface 87b.

<Cover support structure>
As shown in FIGS. 14, 15, and 40, a cover 41 is provided on one side of the body 2 in the width direction. Specifically, the cover 41 is provided on the right side of the body 2 and on the right side of the cabin 3, as shown by the phantom line in FIG. It can be opened toward the right outside). A grip 41 a that can be gripped when the operator opens the cover 41 is provided at the right rear portion of the cover 41.

  As shown in FIG. 15, the cover 41 covers the upper, right and front sides of the hydraulic oil tank 15 and the control valve 26. The hydraulic oil tank 15 is mounted on the right rear portion of the turning substrate 11. The hydraulic oil tank 15 has a substantially rectangular parallelepiped shape, and the height direction is longer than the front-rear direction and the body width direction. That is, the hydraulic oil tank 15 is arranged vertically. A control valve 26 is attached to the front surface of the hydraulic oil tank 15 via a mounting bracket 46. The control valve 26 is a valve unit in which a plurality of valves are aligned and integrated, and the plurality of valves are arranged side by side in the height direction (vertical direction). That is, the control valve 26 is arranged vertically.

  The plurality of valves constituting the control valve 26 are a swing control valve that controls the supply of hydraulic oil to the swing cylinder 19, a boom control valve that controls the supply of hydraulic oil to the boom cylinder 20, and the arm cylinder 21. Arm control valve for controlling the supply of hydraulic oil, work tool control valve for controlling the supply of hydraulic oil to the work tool cylinder 22, dozer control valve for controlling the supply of hydraulic oil to the dozer cylinder 37, and swing motor Control valve for turning to control the supply of hydraulic fluid to the vehicle, control valve for driving to control the supply of hydraulic fluid to the travel motor of the traveling device 4, and control for service port to control the supply of hydraulic fluid to the hydraulic attachment Such as a valve.

As shown in FIGS. 15 and 16, a support member 150 is provided in front of the control valve 26. The support member 150 is provided on one side in the body width direction. Specifically, the support member 150 is provided in the right front portion of the airframe 2. The upper and right sides (one side in the body width direction) and the front side of the support member 150 and the front are covered with a cover 41.
As shown in FIGS. 16 to 19, the support member 150 includes a first support member 151 and a second support member 152.

  As shown in FIG. 16, the first support member 151 is attached to the airframe 2 via a base member 159. The base member 159 includes a bracket 160 and a base plate 161. The bracket 160 is fixed to the body 2. Specifically, the bracket 160 is fixed to the side surface (right surface) of the longitudinal rib 11a extending in the front-rear direction on the revolving board 11 on the outer side of the machine body. The base plate 161 is fixed to the upper part of the bracket 160 with bolts and extends toward the outside (right side) of the machine body. A first support member 151 is attached to the base plate 161.

As shown in FIGS. 17-19, the 1st support member 151 has the board | substrate part 151a and the 1st board part 151b.
The substrate portion 151a is connected to the upper surface of the base plate 161 by a connection member (bolt) 158 and extends rearward (to the control valve 26 side). As shown in FIGS. 18 and 19, the substrate portion 151a is provided with a fourth hole 151d. The fourth hole 151d is a long hole formed so that the length in the front-rear direction is longer than the length in the body width direction. The fourth hole 151d penetrates the substrate portion 151a in the vertical direction. An insertion portion (screw shaft) 159a of the connection member 158 is inserted into the fourth hole 151d. The insertion portion 159 a of the connection member 158 is screwed into a fifth hole (screw hole) 161 a provided in the base plate 161.

  As shown in FIGS. 18 and 19, a first hole 151c is formed in the first plate portion 151b. The first hole 151c is a screw hole that penetrates the first plate portion 151b in the vertical direction. The first plate portion 151b is connected to the upper surface of the rear portion of the substrate portion 151a by welding or the like, and extends rearward from the substrate portion 151a. In the case of the present embodiment, the substrate portion 151a and the first plate portion 151b are configured from separate members, but may be configured from a single member.

  A support 162 is fixed to the upper surface of the first support member 151 (the upper surface of the substrate portion 151a). The support 162 supports a fulcrum shaft 163 that is an opening / closing fulcrum of the cover 41. The fulcrum shaft 163 is arranged substantially parallel (substantially horizontally) to the upper surface of the turning substrate 11. As shown in FIG. 5, the fulcrum shaft 163 extends in a direction of moving to the rear K4 as it goes outward of the machine body K3. One end side of the coil spring 164 is fixed to the fulcrum shaft 163. The other end side of the coil spring 164 is fixed to the support 162. The coil spring 164 biases the fulcrum shaft 163 in one direction around the axis (the direction in which the cover 41 closes).

  As shown in FIG. 16, an oscillating body 165 is attached to the fulcrum shaft 163. The swing body 165 swings around the axis of the fulcrum shaft 163. The rocking body 165 has a fulcrum shaft attachment portion 165a, an extension portion 165b, and an attachment plate 165c. The fulcrum shaft attachment portion 165a is attached to one end side (outside the machine body) of the fulcrum shaft 163. The extension part 165b includes a lateral extension part 165b1 and a vertical extension part 165b2. The laterally extending portion 165b1 extends from the fulcrum shaft attaching portion 165a outward and rearward of the machine body. The vertically extending portion 165b2 extends upward from the extending end of the horizontally extending portion 165b1. The attachment plate 165c is fixed to the upper part and the lower part of the longitudinally extending part 165b2. The attachment plate 165c is attached to the inner surface of the right front portion of the cover 41 with a bolt. Thereby, the cover 41 is attached to the rocking body 165.

  When opening the cover 41, the grip 41a is gripped and the rear part of the cover 41 is lifted. Then, the oscillating body 165 fixed to the front portion of the cover 41 oscillates in the other direction around the axis of the fulcrum shaft 163 so as to go from the state of rising substantially vertically toward the front lower side. Thereby, the cover 41 is opened forward and upward (see a virtual line in FIG. 40). When the cover 41 is closed, by pushing down the rear part of the cover 41, the swinging body 165 is swung in one direction around the axis of the fulcrum shaft 163 toward the rear upper side.

  As shown in FIG. 16, a mounting shaft 155 is fixed to the lower surface of the first support member 151 (the lower surface of the first plate portion 151b). A stopper plate 156 is attached to the attachment shaft 155 so as to be rotatable around the axis of the attachment shaft 155. The stopper plate 156 regulates the rotation range when the cover 41 is opened and closed. Although not shown, the stopper plate 156 has a long hole, and a projecting shaft provided on the fulcrum shaft mounting portion 165a is movably inserted into the long hole. The protruding shaft can move along the elongated hole as the rocking body 165 swings, and the rotation range of the cover 41 is restricted by the movable range (length of the elongated hole).

  As shown in FIGS. 17 and 18, the second support member 152 is attached to the first support member 151. The second support member 152 is formed in a substantially L shape having a horizontal part (second plate part) 152 a and a vertical part 152 b, and the horizontal part 152 a is attached to the first support member 151. A second hole 152c is formed in the horizontal portion 152a. The second hole 152c penetrates the horizontal portion 152a in the vertical direction. The number of the second holes 152c is the same as that of the first holes 151c provided in the first support member 151, and is two in the present embodiment. A mounting portion 152d is provided on the vertical portion 152b. As shown in FIG. 16, a switching valve 170 is attached to the attachment portion 152d. The attachment portion 152d has an attachment hole 152e, and the switching valve 170 is attached by a bolt inserted into the attachment hole 152e. As shown in FIG. 15, the upper side and the right side (one side in the body width direction) and the front side of the switching valve 170 are covered with a cover 41.

  The switching valve 170 is a three-way switching valve. The switching valve 170 is a valve that switches the state of the hydraulic oil supply path for a hydraulic device (for example, a hydraulic attachment or the like). In the case of the present embodiment, the switching valve 170 is a so-called third-line valve, and is a valve that enables the hydraulic oil to be returned to the hydraulic oil tank 15 without the control valve 26 by a switching operation. However, the switching valve 170 may be a valve other than the third line valve.

  As shown in FIG. 16, the switching valve 170 has an inlet port 171, a first outlet port 172, a second outlet port 173, and an operation handle 174. The switching valve 170 operates the operation handle 174 to change the destination of the hydraulic oil introduced from the inlet port 171 to a first state where the first outlet port 172 is used, and a second state where the second outlet port 173 is used. Can be switched to.

  A third hydraulic hose 175 is connected to the inlet port 171. The third hydraulic hose 175 is connected to a hydraulic device (for example, a hydraulic attachment or the like), and constitutes a return oil path for returning the hydraulic oil from the hydraulic device to the hydraulic oil tank 15. A fourth hydraulic hose 176 is connected to the first outlet port 172. The fourth hydraulic hose 176 is connected to the inlet port of the control valve 26. A fifth hydraulic hose 177 is connected to the second outlet port 173. The fifth hydraulic hose 177 is connected to the hydraulic oil tank 15.

  When the operation handle 174 is switched to the first state, the hydraulic oil introduced from the inlet port 171 through the third hydraulic hose 175 exits from the first outlet port 172 and passes through the fourth hydraulic hose 176 to the control valve 26. enter. When the operation handle 174 is switched to the second state, the hydraulic oil introduced from the inlet port 171 exits the second outlet port 173, passes through the fifth hydraulic hose 177, and does not enter the control valve 26, so that the hydraulic oil tank 15 Return to.

As shown in FIGS. 17 and 18, the first support member 151 and the second support member 152 are connected by a connection member 178. The connection member 178 has an insertion portion 178a that is inserted into the first hole 151c and the second hole 152c. In the present embodiment, the connecting member 178 is a bolt, and the insertion portion 178a is a screw shaft of the bolt.
The connection between the first support member 151 and the second support member 152 by the connection member 178 (attachment of the second support member 152 to the first support member 151) is the horizontal portion (second plate portion) of the second support member 152. This is performed by overlapping 152a above (or below) the first plate portion 151b of the first support member 151. Specifically, the first hole 151c and the second hole 152c are overlapped, the insertion portion 178a of the connection member 178 is inserted into the second hole 152c, and the insertion portion 178a is screwed into the first hole 151c which is a screw hole. Is done. The first hole 151c is a through hole that is not a screw hole, and a nut is screwed into the insertion portion 178a inserted into the through hole, thereby connecting the first support member 151 and the second support member 152. Also good.

The support member 150 can be assembled to the airframe 2 after the first support member 151 and the second support member 152 are connected (sub-assembled) by the connection member 178.
At least one of the first support member 151 and the second support member 152 has a position adjustment unit 153. The position adjustment unit 153 can adjust the relative position between the first support member 151 and the second support member 152. In other words, the position adjustment unit 153 can adjust the position of the second support member 152 relative to the first support member 151.

  The position adjustment unit 153 includes at least one of a first hole 151 c provided in the first support member 151 and a second hole 152 c provided in the second support member 152. The hole (at least one of the first hole 151c and the second hole 152c) is formed in a size having a play gap (clearance) with respect to the outer diameter of the insertion portion 178a of the connection member 178. That is, the position adjustment unit 153 includes a hole formed in a size having a play gap with respect to the outer diameter of the insertion unit 178a. In the present embodiment, since the first hole 151c is a screw hole, the second hole 152c is formed in a size having a play gap (that is, the second hole 152c is included in the position adjusting unit 153). When the first hole 151c is a through-hole that is not a screw hole (when a nut is used), either or both of the first hole 151c and the second hole 152c are free from the outer diameter of the insertion portion 178a. It can be formed in a size having a gap. In this case, one or both of the first hole 151c and the second hole 152c are included in the position adjustment unit 153.

  The method of forming the first hole 151c and / or the second hole 152c with a size having a play gap is, for example, a method of making the diameter (inner diameter) of the circular hole larger than the outer diameter of the insertion portion 178a, or the shape of the hole Is a shape other than a circle such as a long hole. In the case of this embodiment, the latter method is adopted. Specifically, the first hole 151c is a screw hole, and one of the two second holes 152c is a long hole.

  The number of the first holes 151c and the second holes 152c may be one, but is preferably plural. When the number of the first holes 151c and the second holes 152c is plural, at least one of the holes may be formed in a size having a play gap. In the case of this embodiment, one second hole 152c1 of the two second holes 152c is formed in a size having a play gap. In addition, when the number of the first holes 151c and the second holes 152c is plural, it is preferable that the plural holes are formed side by side in the body width direction. In the case of the present embodiment, two first holes 151c are formed side by side in the body width direction, and two second holes 152c are also formed side by side in the body width direction.

Hereinafter, the operation of the position adjustment unit 153 will be described with reference to FIG.
FIG. 19 shows a case where the two first holes 151c are formed as screw holes, and one of the two second holes 152c (the body side) is formed in a size having a play gap CL1. ing. The second hole 152c1 is formed as a long hole that is longer in the front-rear direction than in the body width direction. In FIG. 19, a solid line indicates a state where the rear portion of the second hole 152c1 overlaps the first hole 151c, and a virtual line indicates a state where the front portion of the second hole 152c1 overlaps the first hole 151c. The outer diameter of the insertion portion 178a of the connection member 178 overlaps the inner diameter of the first hole 151c, and a play gap CL1 is formed between the insertion portion 178a and the second hole 152c1. By forming the play gap CL1 in this way, the position of the second hole 152c1 with respect to the first hole 151c can be shifted from the solid line position to the virtual line position. That is, the position of the second support member 152 relative to the first support member 151 can be adjusted. Specifically, the rotational movement of the second plate portion 152c relative to the first plate portion 151b can be allowed.

  In addition, although not shown in figure, the linear movement of the 2nd board part 152c with respect to the 1st board part 151b is also accept | permitted by forming both the two 2nd holes 152c into a long hole. That is, the play gap CL1 may allow rotational movement of the second support member 152 relative to the first support member 151, may allow linear movement, or allow both movements. You may do. It is preferable that the movement of the second support member 152 with respect to the first support member 151 includes movement in the body width direction (outside of the body or inward of the body) regardless of whether it is rotational movement or linear movement.

As shown in FIG. 16, a fulcrum shaft 163 serving as an opening / closing fulcrum of the cover 41 is attached to the first support member 151. A switching valve 170 is attached to the second support member 152. Therefore, the relative position between the fulcrum shaft 163 and the switching valve 170 can be adjusted by adjusting the relative position between the first support member 151 and the second support member 152.
The first support member 151 has a second position adjustment unit 154. The second position adjustment unit 154 can adjust the position of the first support member 151 relative to the machine body 2. Specifically, the 2nd position adjustment part 154 makes it possible to adjust the position of the 1st support member 151 with respect to the base member 159 (base plate 161).

The second position adjustment unit 154 includes a fourth hole 151 d provided in the first support member 151.
The connection member 158 that connects the first support member 151 and the base member 159 (the base plate 161) has an insertion portion 158a that is inserted into the fourth hole 151d and the fifth hole 161a. As described above, in the present embodiment, the connection member 158 is a bolt, and the insertion portion 158a is a screw shaft of the bolt. The fourth hole 151d is a long hole, and the fifth hole 161a is a screw hole.

  As shown in FIG. 20, a play gap CL2 is formed between the insertion portion 158a of the connection member 158 and the fourth hole 151d. In other words, the fourth hole 151d constituting the second position adjusting portion 154 is formed to have a size having a play gap with respect to the outer diameter of the insertion portion (screw shaft) 158a. In FIG. 20, a solid line indicates a state where the rear portion of the fourth hole 151d overlaps the screw hole 161a, and a virtual line indicates a state where the front portion of the fourth hole 151d overlaps the screw hole 161a. A play gap CL2 is formed between the insertion portion 158a and the fourth hole 151d. By forming the play gap CL2 in this way, the position of the fourth hole 151d with respect to the screw hole 161a can be shifted from the solid line position to the virtual line position. That is, the position of the fourth hole 151d with respect to the screw hole 161a can be adjusted by using the play gap CL2. Thereby, the position of the 1st support member 151 with respect to the base member 159 can be adjusted. Therefore, the position of the fulcrum shaft 163 and the position of the cover 41 with respect to the body 2 can be adjusted.

  In the example shown in FIG. 20, the second position adjustment unit 154 performs position adjustment of the first support member 151 with respect to the base member 159 by linear movement, but instead of or in addition to adjustment by linear movement, Adjustment by rotational movement may be possible. The change in the moving direction can be realized by changing the shape and size of the fourth hole 151d provided in the substrate portion 151a.

<Bonnet locking structure>
As shown in FIGS. 21, 22, and 40, a bonnet 43 is provided at the rear of the machine body 2. The bonnet 43 is provided so as to be openable and closable with respect to the machine body 2 and covers the rear of the prime mover 13.
As shown in FIGS. 21 to 23, the bonnet 43 is supported by support legs 70 erected on the rear portion of the turning substrate 11. The support leg 70 includes a first leg 71, a second leg 72, a third leg 73, a fourth leg 74, and a support base 75. The first leg 71 is erected on the right front side of the prime mover 13. The second leg 72 is erected on the left front side of the prime mover 13. The third leg 73 is erected on the right rear side of the prime mover 13. The fourth leg 74 is erected on the left rear side of the prime mover 13. The upper portions of the first leg 71 and the second leg 72 are bent toward the rear. The upper portions of the third leg 73 and the fourth leg 74 are bent forward. The support base 75 extends in the body width direction, and connects the upper part of the first leg 71, the upper part of the second leg 72, the upper part of the third leg 73, and the upper part of the fourth leg 74.

  As shown in FIGS. 23 and 24, a rotation support member 44 that constitutes a rotation fulcrum of the bonnet 43 is attached to the fourth leg 74. The rotation support member 44 includes a first fixed portion 44a, a second fixed portion 44b, a movable portion 44c, and a support shaft 44d. The first fixing portion 44 a is fixed to the rear surface of the fourth leg 74. The second fixing portion 44 b is fixed to the inner surface of the second cover 42 provided on the left side of the bonnet 43. The movable part 44c is bent in a substantially U shape in plan view. One end of the movable portion 44c is connected to the fixed portion 44a via a support shaft 44d. The other end portion of the movable portion 44c is fixed to the inner surface of the left portion of the bonnet 43 through a mounting plate 44e. The support shaft 44d extends in the vertical direction. Accordingly, as shown in FIGS. 24 and 25, the movable portion 44c can be rotated forward or backward around the support shaft 44d. More specifically, when the movable portion 44c rotates rearward around the support shaft 44d, the bonnet 43 rotates rearward and is opened (see FIG. 25). When the movable portion 44c is rotated forward around the support shaft 44d, the bonnet 43 is rotated forward and closed (see FIG. 24).

  As shown in FIGS. 22 to 25, a locking piece 80 is provided on one side (left part) of the hood 43 in the body width direction. The locking piece 80 is composed of a hook that is curved like a bowl in plan view. As shown in FIG. 22, FIG. 26, etc., the locking piece 80 protrudes forward (in a direction away from the bonnet 43) from the housing cover 77 provided on the bonnet 43. A protruding portion (front end portion) of the locking piece 80 from the housing cover 77 is locked to a locking shaft 925 of a receiving member 90 described later.

  As shown in FIG. 26, the rear end portion of the locking piece 80 is fixed to the operation plate 78 accommodated in the accommodation cover 77. The operation plate 78 is rotatably supported by the accommodation cover 77 via a vertical axis 79. As shown in FIG. 28, by rotating the operation plate 78 about the vertical axis 79, the locking piece 80 rotates about the vertical axis 79 integrally with the operation plate 78. As shown in FIG. 21, the operation plate 78 is exposed on the rear surface of the hood 43, and can be manually rotated from the rear surface.

  As shown in FIG. 26, a first plate 96 is fixed to the lower part of the front surface of the housing cover 77. A second plate 97 is attached to the first plate 96 with bolts 98. In addition, you may comprise the 1st board 97 and the 2nd board 97 from one member. An insertion plate 95 is fixed to the second plate 97. The insertion plate 95 is disposed with one surface facing upward and the other surface facing downward, and extends in a direction away from the hood 43. The insertion plate 95 is located below the locking piece 80. The insertion plate 95 is inserted into a slit 923 of the receiving member 90 described later.

As shown in FIGS. 22 to 25, the airframe 2 is provided with a receiving member 90 on which the locking piece 80 is locked when the bonnet 43 is closed. The receiving member 90 is attached to the support leg 70. When the locking piece 80 is locked to the receiving member 90, the closed state of the bonnet 43 is maintained.
As shown in FIGS. 26, 27, 29, and 30, the receiving member 90 includes a first receiving member 91 and a second receiving member 92.

  The first receiving member 91 is attached to the rear surface of the third leg 73 erected on the right rear portion of the machine body 2. As shown in FIGS. 29 and 30, the first receiving member 91 has a first attachment portion 911 and a second attachment portion 912. The first mounting portion 911 and the second mounting portion 912 are formed by bending a single plate at a substantially right angle. The first mounting portion 911 has one surface facing forward and the other surface facing rear. The second mounting portion 912 has one surface facing left and the other surface facing right.

  As shown in FIG. 30, the first attachment portion 911 is attached to the rear surface of the third leg 73 with a bolt 99. A second receiving member 92 is attached to the second attachment portion 912. As shown in FIGS. 27 and 29, the second mounting portion 912 has projecting portions 912a and 912b projecting rearward. The protruding portion 912 a is provided on the upper portion of the first receiving member 91. The protruding portion 912 b is provided at the lower portion of the first receiving member 91. A first hole 91a is formed in each of the protrusions 912a and 912b. That is, the first hole 91a is formed in the upper part and the lower part of the second attachment part 912, respectively.

  As shown in FIGS. 26, 30 and the like, the second receiving member 92 has a flat plate shape, and one surface faces leftward and the other surface faces rightward. The 2nd receiving member 92 is extended toward back (from the body 2 side toward the bonnet 43 side). The second receiving member 92 has a mounting portion 921, a locking portion 922, and a slit 923. The attachment portion 921 is provided on the upper and lower portions of the second receiving member 92 and is attached to the second attachment portion 912 of the first receiving member 91. Each attachment portion 921 has a second hole 92a. The number of the second holes 92a is the same as the number of the first holes 91a provided in the first receiving member 91. In the present embodiment, the number is two.

  As shown in FIGS. 26, 29, and 30, the first receiving member 91 and the second receiving member 92 are connected by a connecting member 94. The connection member 94 includes a bolt 94a, a nut 94b, and a washer 94c. Connection of the first receiving member 91 and the second receiving member 92 by the connecting member 94 (attachment of the second receiving member 92 to the first receiving member 91) is one surface (left surface) of the mounting portion 921 of the second receiving member 92. ) Is overlapped with the other surface (right surface) of the second mounting portion 912 of the first receiving member 91. Specifically, the first hole 91a, the second hole 92a, and the washer 94c are overlapped, the screw shaft 94d of the bolt 94a is inserted, and the nut 94b is screwed onto the screw shaft 94d. Hereinafter, the screw shaft 94d is referred to as an insertion portion 94d.

As shown in FIGS. 26 and 30, the locking portion 922 of the second receiving member 92 has a recess 924 and a locking shaft 925.
The concave portion 924 is formed by cutting out the rear edge (the edge on the bonnet 43 side) of the second receiving member 92 toward the front (from the bonnet 43 side toward the machine body 2 side). The recess 924 is formed in a substantially rectangular shape, and has an upper edge 924a, a lower edge 924b, and a front edge 924c. The upper edge 924a and the lower edge 924b extend in the front-rear direction in parallel with each other. The front edge 924c extends in the vertical direction and connects the front part of the upper edge 924a and the front part of the lower edge 924b.

  The locking shaft 925 is a columnar shaft and extends in the vertical direction on the rear side (bonnet 43 side) of the recess 924. As shown in FIG. 30, the locking shaft 925 is fixed to the other surface (right surface) of the second receiving member 92 by welding or the like. The upper portion of the locking shaft 925 is fixed above the rear portion of the upper edge 924a of the recess 924. The lower part of the locking shaft 925 is fixed to the lower part of the rear part of the lower edge 924b of the recess 924. The inner edge (upper edge 924a, lower edge 924b, front edge 924c) of the recess 924 and the locking shaft 925 form a substantially rectangular space 926 into which the tip of the locking piece 80 is inserted.

As shown in FIG. 28, the locking shaft 925 and the vertical axis 79 are arranged side by side in a direction (front-rear direction) parallel to the extending direction of the second receiving member 92 when the bonnet 43 is closed. In FIG. 28, the arrangement direction of the locking shaft 925 and the vertical axis 79 is indicated by a one-dot chain line L.
As shown in FIGS. 27 and 28, the locking piece 80 is locked to the locking portion 922. Specifically, the locking piece 80 is locked to the locking shaft 925 of the locking portion 922. When the locking piece 80 is locked to the locking shaft 925, the closed state of the bonnet 43 can be maintained. The bonnet 43 can be opened by releasing the locking of the locking piece 80 with respect to the receiving member 90.

  The locking piece 80 can be locked and released from the receiving member 90 by operating the operation plate 78. Specifically, as shown in FIG. 28, the operating piece 78 is swung so that the locking piece 80 rotates with the operating shaft 79 as a fulcrum. When the locking piece 80 is rotated forward, the state where the locking with respect to the locking shaft 925 is released (see the phantom line) is switched to the locked state (see the solid line). On the other hand, when the locking piece 80 is rotated forward, the locking piece 80 is switched from the state where the locking piece 80 is locked to the locking shaft 925 (see the solid line) to the state where the locking is released (see the virtual line). . In FIG. 27, the state where the locking piece 80 is locked to the locking shaft 925 is indicated by a virtual line, and the state where the locking is released is indicated by a solid line. As shown in FIG. 31, when the locking piece 80 is released from the locking shaft 925, the bonnet 43 can be opened.

  As shown in FIGS. 26, 27, 29, and 30, a slit 923 is provided below the locking portion 922. The slit 923 is cut from the bonnet 43 side (rear side) toward the machine body 2 side (front side). The slit 923 is formed wider on the bonnet 43 side than on the machine body 2 side. Specifically, as shown in FIG. 30, the slit 923 has an extended portion 923a having a wider width on the bonnet 43 side. The extended portion 923a is provided at the rear portion of the slit 923, and is formed so that the width gradually increases toward the rear.

  As shown in FIGS. 27 and 28, the insertion plate 95 is inserted into the slit 923 in a state where the hood 43 is closed. The insertion plate 95 has a function of suppressing vibration of the bonnet 43 when the bonnet 43 is closed. Further, by inserting the insertion plate 95 into the slit 923, the locking piece 80 is reliably guided to an appropriate position (a position where locking is possible) with respect to the locking shaft 925. The extension portion 923a functions as a guide when the insertion plate 95 is inserted into the slit 923. When the bonnet 43 is opened, the insertion plate 95 shifts from the state inserted in the slit 923 (refer to FIG. 28) to the detached state (refer to FIG. 31).

  At least one of the first receiving member 91 and the second receiving member 92 has an adjustment portion 93. The adjusting unit 93 can adjust the relative position of the first receiving member 91 and the second receiving member 92. In other words, the adjustment unit 93 can adjust the position of the second receiving member 92 with respect to the first receiving member 91. As shown in FIGS. 29 and 30, the adjustment unit 93 includes an upper adjustment unit 93 </ b> A and a lower adjustment unit 93 </ b> B. The upper adjustment portion 93A is provided above the locking portion 922. The lower adjustment portion 93 </ b> B is provided below the locking portion 922. The slit 923 is located between the upper adjustment unit 93A and the lower adjustment unit 93B.

  The adjustment part 93 (upper adjustment part 93A, lower adjustment part 93B) is at least one of a first hole 91a provided in the first receiving member 91 and a second hole 92a provided in the second receiving member 92. Including holes. The hole (at least one of the first hole 91a and the second hole 92a) is formed in a size having a clearance (clearance) with respect to the outer diameter of the insertion portion 94d of the bolt 94a. That is, the adjustment part 93 includes a hole formed in a size having a play gap with respect to the outer diameter of the insertion part 94d. The play gap allows movement of the second receiving member 92 relative to the first receiving member 91 in the up-down direction and the front-rear direction.

  A method of forming the first hole 91a and / or the second hole 92a to have a size having a play gap includes a method of making the diameter (inner diameter) of the circular hole larger than the outer diameter of the insertion portion 94d, and lengthening the shape of the hole. The method of making it shapes other than circular, such as a hole, is mentioned. In the case of this embodiment, the former method is adopted. Specifically, the first hole 91a and the second hole 92a are circular holes, the inner diameter of the first hole 91a is larger than the inner diameter of the second hole 92a, and there is a play gap with respect to the outer diameter of the insertion portion 94d. It is formed in size.

  As shown in FIG. 32, in the case of the present embodiment, of the first hole 91a and the second hole 92a, the first hole 91a is formed to have a size having a play gap CL3 with respect to the outer diameter of the insertion portion 94d. Yes. In FIG. 32, the outer diameter of the insertion portion 94d overlaps the inner diameter of the first hole 91a, and a play gap CL3 is formed between the insertion portion 94d and the first hole 91a. In this case, the position of the first hole 91a with respect to the insertion portion 94d can be adjusted. Thereby, the position of the 2nd receiving member 92 with respect to the 1st receiving member 91 can be adjusted using the play clearance CL3. When the position of the second receiving member 92 with respect to the first receiving member 91 shown in FIG. 32B is used as the reference position, FIG. 32A shows the position of the second receiving member 92 behind the reference position (on the bonnet 43 side). 32 (c) shows a state where the position of the second receiving member 92 is shifted forward (airframe 2 side) from the reference position. Thus, the position of the second receiving member 92 relative to the first receiving member 91 can be adjusted forward or backward. Although not shown, the position of the second receiving member 92 relative to the first receiving member 91 can be adjusted upward or downward.

  Here, the first receiving member 91 is fixed to the machine body 2, and the second receiving member 92 is provided with a locking portion 922. Therefore, by adjusting the position of the second receiving member 92 with respect to the first receiving member 91, the position of the locking portion 922 in the machine body 2 can be adjusted. Thereby, the position of the latching | locking part 922 with respect to the latching piece 80 provided in the bonnet 43 can be adjusted.

  In addition, at least one of the first receiving member 91 and the machine body 2 includes a second adjustment unit that can adjust the relative position of the first receiving member 91 and the machine body 2. The second adjustment portion includes at least one of a hole provided in the first attachment portion 911 of the first member 91 and a hole provided in the third leg 73 of the support leg 70. These holes are holes for attaching the first receiving member 91 to the third leg 73, and are holes through which the screw shafts of the bolts 99 shown in FIG. 30 are inserted.

  At least one of the hole provided in the first mounting portion 911 and the hole provided in the third leg 73 has a size having a clearance (clearance) with respect to the outer diameter of the screw shaft of the bolt 99. Is formed. That is, a hole formed in a size having a play gap with respect to the outer diameter of the screw shaft of the bolt 99 is included in the second adjustment portion. This play gap allows the movement of the first receiving member 91 relative to the machine body 2 in the vertical direction and the horizontal direction.

<Belt tension adjustment device>
FIG. 33 is a view of the prime mover 13 as viewed from the output shaft (crank shaft, power transmission shaft) side. FIG. 34 is a view of the prime mover 13 as viewed from above.
A drive pulley 101 is attached to the output shaft 13 a of the prime mover 13. The drive pulley 101 has two belt grooves arranged in the axial direction of the output shaft 13a. Endless (looped) belts (a first belt 104 and a second belt 107 described later) are wound around the two belt grooves, respectively.

  A fan pulley 102 is provided above the drive pulley 101. A fan 23 is connected to the fan pulley 102 (the fan 23 is not shown in FIG. 33). In front of the fan pulley 102, an input pulley 103 of the alternator 24 is provided. The rotational axes of the drive pulley 101, the fan pulley 102, and the input pulley 103 are arranged in parallel to each other. The driving pulley 101, the fan pulley 102, and the input pulley 103 are arranged in a triangular shape when viewed from the output shaft 13a side. A belt (first belt) 104 is stretched over the drive pulley 101, the fan pulley 102, and the input pulley 103. Power from the output shaft 13 a of the prime mover 13 is transmitted from the driving pulley 101 to the fan pulley 102 and the input pulley 103 via the first belt 104. Thereby, the fan 23 and the alternator 24 are driven by driving the prime mover 13.

  A driven pulley 105 is provided above and behind the drive pulley 101. The driven pulley 105 is an input pulley provided in the compressor (driven device) 25. A tension pulley 106 is provided above the driving pulley 101 and in front of the driven pulley 105. The rotation axes of the drive pulley 101, the driven pulley 105, and the tension pulley 106 are arranged in parallel to each other. The driving pulley 101, the driven pulley 105, and the tension pulley 106 are arranged in a triangular shape when viewed from the output shaft 13a side. A belt (second belt) 107 is stretched over the drive pulley 101, the driven pulley 105, and the tension pulley 106. The second belt 107 transmits the rotational driving force of the output shaft (power transmission shaft) 13 a to the compressor (driven device) 25. The tension of the second belt 107 can be adjusted by the belt tension adjusting device 100.

Hereinafter, the configuration of the belt tension adjusting device 100 will be described mainly based on FIGS. 35 to 39.
The belt tension adjusting device 100 includes a support shaft 108, a bracket 110, a rotating member 120, and a rotation operation mechanism 130.
The support shaft 108 is provided above and to the left of the tension pulley 106, and is supported so as to be rotatable at a position different from the rotation shaft 106a of the tension pulley 106. The support shaft 108 is parallel to the rotation shaft 106a, and one end side is disposed on the tension pulley 106 side (right side), and the other end side is disposed on the opposite side (left side) to the tension pulley 106 side. The support shaft 108 is rotatably supported by the bracket 110.

  As shown in FIGS. 33 and 34, the bracket 110 is disposed above the prime mover 13. As shown in FIGS. 35 and 36, the bracket 110 has a first main member 111, a second main member 112, a first sub member 113, a second sub member 114, and a third sub member 115. The first main member 111, the second main member 112, the first sub member 113, the second sub member 114, and the third sub member 115 are connected and integrated by welding or the like.

  The first main member 111 is a plate-like member extending in the front-rear direction (a direction orthogonal to the output shaft 13a), and one surface faces right and the other surface faces left. As shown in FIGS. 33 to 35, the first main member 111 has one end side (front end side) positioned above the compressor 25 and the other end side (rear end side) above the tension pulley 106 and to the left. positioned. As shown in FIGS. 35 and 36, the first main member 111 has a first through hole 110a on one end side and a second through hole 110b on the other end side.

  As shown in FIG. 36, the second main member 112 has an upper part 112a, a front part 112b, and a rear part 112c. The upper part 112a, the front part 112b, and the rear part 112c are integrally formed by bending one strip-shaped plate. The upper portion 112a is connected to the other surface (left surface) of the first main member 111 and extends in the front-rear direction. The front portion 112b has a vertical portion that is bent from the front portion of the upper portion 112a and extends downward, and a horizontal portion that is bent from the lower end portion of the vertical portion and extends forward. A third through hole 110c is provided in the vertical portion of the front portion 112b. A fourth through hole 110d is provided in the lateral portion of the front portion 112b. The rear portion 112c has a vertical portion that is bent from the rear portion of the upper portion 112a and extends downward, and a horizontal portion that is bent from the lower end portion of the vertical portion and extends forward. A fifth through hole 110e is provided in the lateral portion of the rear portion 112c.

  The first sub member 113 extends in the body width direction (left-right direction). One end side (left side) of the first sub member 113 is bent downward and connected to the other side (left side) of the first main member 111. A sixth through hole 110 f is provided on the other end side (left side) of the first sub member 113. As shown in FIGS. 35 and 37, a clamp 136 for holding a pipe connected to the compressor 25 is attached to the first sub member 113.

  The second sub member 114 has an intermediate part 114a, a right part 114b, and a left part 114c. The intermediate portion 114a is connected to the front portion 112b of the second main member 112 and extends in the body width direction. The right portion 114b is bent from one end (right end) of the intermediate portion 114a and extends forward. The left portion 114c is bent from the other end (left end) of the intermediate portion 114a and extends forward. A seventh through hole 110g is provided in the right part 114b and the left part 114c.

  The third sub member 115 is a plate-like member, and one surface faces rightward and the other surface faces leftward. The third sub member 115 is connected to the upper portion 112 a of the second main member 112. As shown in FIG. 35, one surface (right surface) of the third sub member 115 is opposed to the other surface (left surface) of the first main member 111 with the upper portion 112a interposed therebetween. The third sub member 115 has an eighth through hole 110h and an elongated hole 115a. The elongated hole 115a is located above the support shaft 108 and is formed in an arc shape with the support shaft 108 as the center.

As shown in FIGS. 35 and 36, the bracket 110 has a fixing portion 116, a support portion 117, and an insertion portion 118.
The fixing part 116 includes a first fixing part 116 </ b> A fixed to the compressor 25 and a second fixing part 116 </ b> B fixed to the prime mover 13. The first fixing portion 116A includes a first through hole 110a, a third through hole 110c, and a seventh through hole 110g. 116 A of 1st fixing | fixed parts insert the bolt in the 1st through-hole 110a, the 3rd through-hole 110c, and the 7th through-hole 110g, and screw the said bolt to the internal thread part provided in the compressor 25, The compressor 25 Fixed to. The second fixing portion 116B includes a fourth through hole 110d, a fifth through hole 110e, and a sixth through hole 110f. The second fixing portion 116B is inserted into the fourth through hole 110d, the fifth through hole 110e, and the sixth through hole 110f, and is screwed into a female screw portion provided in the prime mover 13, thereby driving the prime mover 13B. Fixed to.

  The support part 117 supports the spindle 108 rotatably. As shown in FIG. 35, the support part 117 is comprised from the cylinder extended in the body width direction (axial center direction of the rotating shaft 106a of a tension pulley). The cylindrical body constituting the support portion 117 is fitted and fixed in the second through hole 110b of the first main member 111 and the eighth through hole 110h of the third sub member 115, and the support shaft 108 is fixed to the cylinder. Penetrates the body. Both ends of the support shaft 108 protrude from the cylindrical body (support portion) 117.

As shown in FIG. 35, the insertion portion 118 passes through the upper portion of the third sub member 115 (above the elongated hole 115a). The insertion portion 118 includes a screw shaft of a bolt 118a, and the screw shaft passes through the third sub member 115 and is inserted into a guide hole 131a of the movable member 131 described later. A nut 118b is screwed onto the screw shaft of the bolt 118a.
The rotating member 120 connects the support shaft 108 and the tension pulley 106, and changes the relative position of the tension pulley 106 with respect to the drive pulley 101 and the driven pulley 105 as the support shaft 108 rotates. Specifically, the rotating member 120 moves the tension pulley 106 as the support shaft 108 rotates. As shown in FIGS. 35 and 37, the rotation member 120 has a first part 121 and a second part 122. The first portion 121 is attached to one end side (right side) of the support shaft 108. Specifically, one end side of the support shaft 108 passes through the first portion 121, and a nut 123 is screwed to a male screw formed in the through portion. The second part 122 extends downward from the first part 121. The second portion 122 supports the rotation shaft 106a of the tension pulley 106 in a rotatable manner.

  Since the first part 121 is attached to the support shaft 108, the first part 121 rotates as the support shaft 108 rotates. The second part 122 rotates about the support shaft 108 as the first part 121 rotates. Since the second portion 122 supports the rotation shaft 106 a of the tension pulley 106, the tension pulley 106 rotates together with the second portion 122. That is, the tension pulley 106 rotates about the support shaft 108 as the support shaft 108 rotates. The rotation direction of the tension pulley 106 is determined according to the rotation direction of the support shaft 108.

The rotation operation mechanism 130 is a mechanism that rotates the support shaft 108 around its axis.
As illustrated in FIGS. 35 to 37, the rotation operation mechanism 130 includes a movable member 131 and an operation unit 132.
The movable member 131 is a plate-like member, and one surface faces rightward and the other surface faces leftward. The movable member 131 has a fan shape when viewed from the axial center direction of the support shaft 108. As shown in FIGS. 36 and 37, the movable member 131 is attached to the other end side (left side) of the support shaft 108. As a result, the movable member 131 can rotate together with the support shaft 108. As shown in FIG. 35 and the like, one surface (right surface) of the movable member 131 is in contact with (or close to) the other surface (left surface) of the third sub member 115.

  The movable member 131 has a guide hole 131a. The guide hole 131a is formed in a circular arc shape with the support shaft 108 as a center. Both the guide hole 131a and the long hole 115a are formed in an arc shape centered on the support shaft 108, but the distance from the support shaft 108 (the radius of curvature of the arc) is different. Specifically, the guide hole 131a is located above the elongated hole 115a (on the side away from the support shaft 108).

  As shown in FIGS. 35 to 37, the insertion portion 118 of the bracket 110 (the screw shaft of the bolt 118a) is inserted into the guide hole 131a. The insertion portion 118 changes its position in the guide hole 131a as the movable member 131 rotates about the support shaft 108. Specifically, when the movable member 131 rotates around the support shaft 108, the insertion portion 118 attached to the bracket 110 does not move, but the guide hole 131a moves together with the movable member 131, so that the insertion portion in the guide hole 131a. The position of 118 changes. The guide hole 131 a and the insertion portion 118 constitute a restriction mechanism that restricts the movement direction and movement range of the movable member 131 relative to the bracket 110, and the restriction mechanism constitutes a part of the rotation operation mechanism 130.

  The operation unit 132 is operated to rotate the movable member 131 together with the support shaft 108. In other words, by operating the operation unit 132, the movable member 131 rotates together with the support shaft 108. As shown in FIGS. 34, 35, and 37, the operation unit 132 is provided on the other end side of the support shaft 108 (on the opposite side to the tension pulley 106 side). As illustrated in FIGS. 35 to 37, the operation unit 132 includes a first fixing member 133, a second fixing member 134, and an adjustment mechanism 135.

  The first fixed member 133 is fixed to the movable member 131. The first fixing member 133 is provided between the support shaft 108 and the guide hole 131a (above the support shaft 108 and below the guide hole 131a). In the case of this embodiment, the 1st fixing member 133 is comprised from the volt | bolt 133a and the nut 133b. The head of the bolt 133 a is disposed on the other surface side (left side) of the movable member 131, and the screw shaft passes through the movable member 131. The nut 133b is screwed to the screw shaft of the bolt 133a on one side (right side) of the movable member 131. The nut 133 b is disposed in the elongated hole 115 a of the third sub member 115, and can move along the elongated hole 115 a as the movable member 131 rotates. As shown in FIG. 36, the first fixing member 133 has a through hole 133c. The through hole 133c is provided at the head of the bolt 133a.

  The second fixing member 134 is fixed to the bracket 110. Specifically, the second fixing member 134 is fixed to the third sub member 115 of the bracket 110. In the case of this embodiment, the second fixing member 134 includes a bolt 134a and a nut 134b. The head of the bolt 134 a is disposed on the other surface side (left side) of the third sub member 115 of the bracket 110, and the screw shaft passes through the third sub member 115. The nut 134b is screwed to the screw shaft of the bolt 134a on one surface side (right side) of the third sub member 115. As shown in FIG. 36, the second fixing member 134 has a through hole 134c. The through hole 134c is provided at the head of the bolt 134a.

The adjustment mechanism 135 is a mechanism that can adjust the distance between the first fixing member 133 and the second fixing member 134. As shown in FIGS. 36 and 37, the adjustment mechanism 135 includes a male screw member 135a, a female screw member (nut) 135b, and a lock member 135c.
One end side (front side) of the male screw member 135 a is fixed to the first fixing member 133, and the other end side (rear side) is inserted through the second fixing member 134. Specifically, one end side of the male screw member 135a is inserted into and fixed to the through hole 133c of the first fixing member 133. The other end side of the male screw member 135a is inserted into the through hole 134c of the second fixing member 134 and is movable in the through hole 134c. The female screw member (nut) 135b abuts on the second fixing member 134 and is screwed to the male screw member 135a on the other end side of the male screw member 135a. Thereby, when the male screw member 135a is rotated, the male screw member 135a moves forward or backward along the hole axial direction of the through hole 134c.

  The lock member 135c is a nut screwed into the male screw member 135a, and functions as a lock nut that prevents the female screw member 135b from loosening. The lock member 135c abuts on the female screw member 135b and is screwed to the male screw member 135a on the other end side (rear side) of the female screw member 135b. That is, the female screw member 135b is sandwiched between the lock member 135c and the second fixing member 134. By tightening the lock member 135c toward the female screw member 135b, the female screw member 135b can be fixed (rotation is locked).

Hereinafter, an operation (operation) of the belt tension adjusting device 100 will be described mainly based on FIGS. 37 to 39.
First, the operation when the tension of the second belt 107 is increased (the second belt 107 is stretched) will be described. 37 and 38, the state before the operation is indicated by a solid line, and the state after the operation is indicated by a virtual line. When increasing the tension of the second belt 107, the female screw member 135b of the operation unit 132 is rotated in the forward direction (arrow A direction). This positive direction is a direction in which the female screw member 135b is tightened. When the female screw member 135b is rotated in the forward direction, the male screw member 135a moves in one direction (the direction of arrow B). When the male screw member 135a moves in one direction (rearward), the first fixed member 133 fixed to the movable member 131 by the male screw member 135a is pulled, and the movable member 131 rotates in the forward direction (arrow C direction) together with the support shaft 108. To do. When the support shaft 108 rotates in the forward direction, the second portion 122 of the rotating member 120 rotates in the forward direction (arrow D direction) around the support shaft 108. As the second portion 122 rotates, the tension pulley 106 rotates in the forward direction (the direction of arrow E) about the support shaft 108. This increases the tension of the second belt 107 (the second belt 107 is stretched).

  Next, an operation for reducing the tension of the second belt 107 (releasing the second belt 107) will be described. 37 and 38, the state before the operation is indicated by a virtual line, and the state after the operation is indicated by a solid line. When decreasing the tension of the second belt 107, the female screw member 135b of the operation unit 132 is rotated in the reverse direction (the direction opposite to the arrow A). This reverse direction is a direction in which the female screw member 135b is loosened. When the female screw member 135b is rotated in the reverse direction, the male screw member 135a moves in the other direction (the direction opposite to the arrow B). When the male screw member 135a moves in the other direction (forward), the first fixing member 133 fixed to the movable member 131 is pushed by the male screw member 135a, and the movable member 131 moves in the reverse direction (the direction opposite to the arrow C direction) together with the support shaft 108. ). When the support shaft 108 rotates in the reverse direction, the second portion 122 of the rotating member 120 rotates in the reverse direction (the direction opposite to the arrow D) around the support shaft 108. As the second portion 122 rotates, the tension pulley 106 rotates in the reverse direction (the direction opposite to the arrow E) around the support shaft 108. Thereby, the tension of the second belt 107 is reduced (the second belt 107 is loosened).

As described above, when the female screw member 135b is rotated in the tightening direction, the second belt 107 is stretched, and when the female screw member 135b is rotated in the loosening direction, the second belt 107 is loosened. Therefore, the operation (tightening or loosening of the female screw member) and the result based on the operation (belt tension or loosening) are likely to coincide with the operator's feeling.
According to the belt tension adjusting device 100 of the above embodiment, the tension pulley 106 can be moved to adjust the tension of the second belt 107. Therefore, the tension of the second belt 107 can be adjusted without moving the compressor (driven device) 25.

  In the above-described embodiment, the belt tension adjusting device 100 is a device that adjusts the tension of the second belt 107, but may be a device that adjusts the tension of the first belt 104. In this case, the alternator 24 is provided with a driven pulley 105, the first belt 104 is wound around the driven pulley 105, the drive pulley 101, and the tension pulley 106, and the tension pulley 106 can be moved by the belt tension adjusting device 100. The structure to do can be adopted.

  The belt tension adjusting device 100 can also be applied to a belt that transmits the power of the prime mover 13 to driven devices (for example, a hydraulic pump or the like) other than the compressor 25 and the alternator 24. In other words, the belt tension adjusting device 100 can be widely applied to a belt wound around a pulley of a driven device that receives and drives the power of the prime mover 13 by belt transmission.

According to the working machine 1 of the embodiment described above, the following effects are obtained.
The work machine 1 includes first support portions 61A and 61B that are arranged along the inner surface of the first horizontal plate 8c and abut against the first horizontal plate 8c, and the first horizontal plate 8c in the first support portions 61A and 61B. And a reinforcing plate 60 having first bent portions 63A and 63B that are bent from a position overlapping the first pivot member 27 toward the second horizontal plate 8d.

  According to this configuration, the first bent portions 63A and 63B, which are portions having high strength, approach the inner surface of the first horizontal plate 8c at a position where the first bent plate 63c overlaps the first pivot member 27 via the first horizontal plate 8c. Thereby, since the boom 8 can be reinforced strongly, the deformation (specifically, between the left plate 27L and the right plate 27R) of the first pivot member 27 caused by the load (thrust) acting from the first hydraulic cylinder 20 is achieved. It is possible to suppress the deformation that widens or narrows). As a result, the stress concentration generated at the end of the first pivot member 27 due to the deformation of the first pivot member 27 due to the thrust of the first hydraulic cylinder 20 can be reduced. Further, since the boom 8 is firmly reinforced by the reinforcing plate 60, the stress concentration generated at the end of the first pivotal support member 27 due to the external force acting on the work device 5 including the boom 8 and the arm 9 is also reduced. can do.

In addition, the first bent portion 63A is formed on the first horizontal plate 8c at a position overlapping the end portion of the first pivot member 27 in the boom length direction and the pivot portion 271 via the first horizontal plate 8c. Close to the inner surface, the first support portions 61A, 61B are extended from the first bent portions 63A, 63B along the inner surface of the first horizontal plate 8c in a direction away from the pivot portion 271.
According to this configuration, the first horizontal plate 8c, which is a position where stress concentration is likely to occur, is located at a position overlapping the end portion in the boom length direction of the first pivot member 27 and the pivot portion 271. Since the bent portions 63A and 63B are close to each other, the stress concentration generated at the end portion of the first pivot member 27 can be effectively reduced. Further, the first support portion 61A extends from the first bent portions 63A and 63B along the inner surface of the first horizontal plate 8c toward the direction away from the pivot portion 271 on the side where stress concentration is likely to occur. Therefore, the stress concentration generated at the end of the first pivot member 27 can be more effectively mitigated.

The reinforcing plate 60 is disposed along the inner surface of the second horizontal plate 8d and is in contact with the second horizontal plate 8d, and the first horizontal plate from the second support portions 62A and 62B. It has 2nd bending part 64A, 64B bent toward 8c side, and connection part 65A, 65B which connects 1st bending part 63A, 63B and 2nd bending part 64A, 64B.
According to this configuration, the strength of the reinforcing plate 60 can be increased by the second bent portions 64A and 64B. Moreover, the boom 8 can be more effectively reinforced by reinforcing the first horizontal plate 8c and the second horizontal plate 8d by the reinforcing plate 60.

Further, a second hydraulic support part having a second hydraulic cylinder 21 different from the first hydraulic cylinder 20 and a second pivot part 281 fixed to the outer surface of the second horizontal plate 8c and pivotally supporting one end of the second hydraulic cylinder 21. The second bent portion 64A is close to the inner surface of the second horizontal plate 8d at a position overlapping the second pivot member 28.
According to this configuration, the second bent portion 64A, which is a portion having high strength, comes close to the inner surface of the second horizontal plate 8d at a position where it overlaps the second pivot member 28 via the second horizontal plate 8d. Thereby, since the second horizontal plate 8d can be reinforced strongly, the deformation (specifically, the left plate 28L and the right plate) of the second pivot member 28 caused by the load (thrust) acting from the second hydraulic cylinder 21. The deformation that expands or narrows between 28R can be suppressed. As a result, stress concentration generated at the end of the second pivot member 28 due to the deformation of the second pivot member 28 due to the thrust of the second hydraulic cylinder 21 can be reduced. In addition, since the second horizontal plate 8d is reinforced strongly, the stress concentration generated at the end of the second pivotal member 28 due to the external force acting on the work device 5 including the boom 8 and the arm 9 is alleviated. be able to.

Further, the second support portion 62A extends from the second bent portion 64A along the inner surface of the second horizontal plate 8d in a direction away from the second pivot plate 281.
According to this configuration, the second support portion 62A is directed to the direction away from the second pivot plate 281 along the inner surface of the second horizontal plate 8d from the second bent portion 64A, which is the side where stress concentration is likely to occur. Since it is extended, the stress concentration generated at the end of the second pivot member 28 can be effectively reduced.

Further, the reinforcing plate 60 is overlapped with the front portion of the first pivotal support member 27 in the boom length direction via the first lateral plate 8c, and the boom of the first pivotal support member 27 via the first lateral plate 8c. Each is provided at a position overlapping the rear portion in the length direction.
According to this configuration, both the position overlapping the front portion of the first pivot member 27 and the position overlapping the rear portion of the first pivot member 27 in the first horizontal plate 8 c can be reinforced by the reinforcing plate 60. The stress concentration generated at the end of the first pivotal support member 27 can be alleviated more effectively.

  The work machine 1 includes a machine body 2, a boom 8 that is pivotally supported by the machine body 2 on the base end side and that has a pivot support portion (front pivot support portion) 83 on the distal end side, and a pivot support shaft (second horizontal axis) 32 on the shaft support portion 83. The pivot support 83 includes a first bearing portion 85 that supports one end of the pivot shaft 32, and a second bearing that supports the other end of the pivot shaft 32. Connecting portion formed by connecting first portion 86, first bearing portion 85 and second bearing portion 86 and having at least one of upper surface 87a and lower surface 87b recessed toward the other surface side. 87.

  According to this configuration, since it is not necessary to place the connection portion 97 on the upper surface 87a side or the lower surface 87b side of the boom 8 in order to secure a space for guiding the hydraulic hose, the connection portion 87 is not required to be disposed on the boom 8 side. Can be provided near the middle in the vertical direction. Therefore, stress concentration generated at the roots of the first bearing portion 85 and the second bearing portion 86 when the torsional force in the turning direction of the airframe 2 is applied to the distal end portion (front shaft support portion 83) of the boom 8 is reduced. The strength of the tip of the boom 8 can be sufficiently secured. Further, since the strength can be ensured, the thickness of the tip portion (front shaft support portion 83) can be reduced, and the boom 8 can be reduced in weight.

The boom 8 is provided with a hydraulic hose extending from the proximal end side to the distal end side, and the first recess 88 is provided with a holding portion 30 for holding the hydraulic hose.
According to this configuration, by providing the holding portion 30 of the hydraulic hose in the first recess 88, the connecting portion 87 can be provided near the middle in the vertical direction of the boom 8 even when the holding portion 30 is provided. Thereby, the stress concentration which arises at the base of the 1st bearing part 85 and the 2nd bearing part 86 can be relieve | moderated appropriately.

The boom 8 has a boom body 81 and a pivotal support portion (front pivotal support portion) 83 attached to the tip of the boom body 81, and the front end 87 e of the connection portion 87 is connected to the upper end of the pivotal shaft 32. Located below the first straight line L1 that connects the middle point M in the vertical direction of the rear end of the support 83 and above the second straight line L2 that connects the lower end of the pivot shaft 32 and the middle point M. Yes.
According to this configuration, since the front end 87e of the connecting portion 87 is positioned at the substantially vertical center of the shaft support portion 83, the first bearing portion is applied when a torsional force is applied to the tip portion (front support portion) of the boom 8. It is possible to prevent stress concentration from occurring at the roots of the 85 and the second bearing portion 86.

In addition, the one surface of the connecting portion 87 is formed as an inclined surface inclined with respect to the boom extending direction, and the first recess 88 is provided on the inclined surface.
According to this configuration, since the first recess 88 is provided on the inclined surface, a space for guiding the hydraulic hose above or below the connecting portion 87 can be ensured.
The other surface of the connecting portion 87 is formed as an inclined surface inclined with respect to the boom extending direction.

According to this configuration, since the upper surface and the lower surface of the connection portion 87 are inclined surfaces, the connection portion 87 has a shape close to symmetry in the vertical direction. Therefore, the first bearing portion 85 and the second bearing portion 86 are formed. It is possible to effectively prevent the occurrence of stress concentration occurring at the root of the surface.
A second recess 89 that is recessed toward the one surface is formed on the other surface of the connecting portion 87.

According to this configuration, the concave portions are formed on the upper surface and the lower surface of the connection portion 87, so that the connection portion 87 has a shape that is more symmetrical in the vertical direction. Therefore, the occurrence of stress concentration can be effectively prevented.
In addition, the rear end portion 87c of the inclined surface formed on the one surface of the connecting portion 87 is located behind the rear end portion 87d of the inclined surface formed on the other surface of the connecting portion 87. .

According to this configuration, since the inclination angle of one surface (upper surface 87a) of the connecting portion 87 is gentler than that of the other surface (lower surface 87b), the hydraulic hose is gently inclined along the upper surface 87a. Can be guided smoothly.
The support member 150 of the work machine 1 includes a first support member 151 that supports a fulcrum shaft 163 that is an opening / closing fulcrum of the cover 41, and a second support that is attached to the first support member 151 and has an attachment portion 152d of the switching valve 170. And at least one of the first support member 151 and the second support member 152 includes a position adjustment unit 153 that can adjust the relative position of the first support member 151 and the second support member 152. Yes.

  According to this configuration, since the relative position between the first support member 151 and the second support member 152 can be adjusted by the position adjustment unit 153, the fulcrum shaft 163 of the cover 41 supported by the first support member 151 and the first support member 151 can be adjusted. 2 The relative position of the switching valve 170 attached to the support member 152 can be adjusted. Thereby, it can prevent easily that the cover 41 interferes with the hydraulic hose etc. which were connected to the switching valve 170. FIG.

  More specifically, the cover 41 adjusts the attachment position (the position of the fulcrum shaft 162) in order to avoid interference with the hydraulic hoses (the fourth hydraulic hose 176, the fifth hydraulic hose 177, etc.) and other members. You may have to. When the fulcrum shaft 163 and the switching valve 170 are attached to the same member (one member), if the fulcrum shaft 163 is moved in order to adjust the position of the cover 41, the switching valve 170 also moves simultaneously. . That is, the relative position between the fulcrum shaft 163 and the switching valve 170 cannot be changed. Therefore, when the hydraulic hose connected to the cover 41 and the switching valve 170 interferes, there arises a disadvantage that the interference cannot be eliminated even if the position of the cover 41 is adjusted.

In the case of the present embodiment, the fulcrum shaft 163 and the switching valve 170 are attached to separate members (first support member 151 and second support member 152), and the position of the second support member 152 relative to the first support member 151. Can be adjusted. Therefore, the relative position between the fulcrum shaft 163 and the switching valve 170 can be changed, and the above-described disadvantage does not occur.
In addition, a connection member 178 that connects the first support member 151 and the second support member 152 is provided. The first support member 151 has a first hole 151c, and the second support member 152 has a second hole 152c. The connection member 178 formed has an insertion portion 178a inserted into the first hole 151c and the second hole 152c, and the position adjustment portion 153 has at least one of the first hole 151c and the second hole 152c. The hole is formed in a size having a play gap with respect to the outer diameter of the insertion portion 178a.

According to this configuration, the relative position between the first support member 151 and the second support member 152 can be adjusted using the play gap while the first support member 151 and the second support member 152 are connected by the connection member 178. It can be.
The first support member 151 has a first plate portion 151b provided with a first hole 151c, and the second support member 152 is provided with a second hole 152c and above or below the first plate portion 151b. The play gaps allow the second plate portion 152a to rotate relative to the first plate portion 151b.

According to this configuration, the rotational movement of the second plate portion 152a with respect to the first plate portion 151b is allowed, so that the planar view position of the switching valve 170 with respect to the fulcrum shaft 163 can be easily adjusted by the rotational movement.
In addition, a base member 159 that is fixed to the body 2 and to which the first support member 151 is attached, and a second position adjustment unit 154 that can adjust the position of the first support member 151 relative to the base member 159 are provided. .

  According to this configuration, the position of the first support member 151 relative to the airframe 2 can be adjusted by the second position adjustment unit 154. Thereby, in addition to the position adjustment of the second support member 152 with respect to the first support member 151, the position adjustment of the first support member 151 with respect to the body 2 can be performed. That is, the switching valve 170 connected to the control valve 26 and the position of the fulcrum shaft 163 serving as the opening / closing fulcrum of the cover 41 can be adjusted independently.

The support member 150 is disposed on one side in the width direction of the machine body 2, the cover 41 covers the upper side of the support member 150 and one side in the machine body width direction, and the play gap is a second gap with respect to the first support member 151. The movement of the support member 152 in the body width direction is allowed.
According to this configuration, the second support member 152 can be moved toward the inside of the machine relative to the first support member 151. Therefore, the switching valve 170 can be moved toward the inside of the machine body with respect to the support shaft 163, and interference between the hydraulic hose and the like connected to the switching valve 170 and the cover 41 can be avoided.

  The hydraulic oil tank 15 that stores hydraulic oil and a control valve 26 that controls the supply of hydraulic oil to the hydraulic equipment are provided. The switching valve 170 includes an inlet port 171 connected to the hydraulic equipment, the control valve 26, and the control valve 26. The first outlet port 172 to be connected, the second outlet port 173 to be connected to the hydraulic oil tank 15, and the destination of the hydraulic oil introduced from the inlet port 171, whichever of the first outlet port 172 and the second outlet port 173 And an operation handle 174 that can be switched to one of them.

According to this configuration, when the switching valve 170 is a so-called third line valve that allows the hydraulic oil to be returned to the hydraulic oil tank 15 without the control valve 26 by a switching operation, the switching valve 170 is connected to the third line valve. Interference between the hydraulic hose thus made and the cover 41 can be avoided.
The work machine 1 is associated with the machine body 2, a bonnet 43 that can be opened and closed with respect to the machine body 2, a locking piece 80 provided on the bonnet 43, and a hood 43 that is provided on the machine body 2 and is closed. A receiving member 90 having a locking portion 922 to which the stop piece 80 is locked. The receiving member 90 has a first receiving member 91 fixed to the machine body 2, a locking portion 922, and a first member. A second receiving member 92 connected to the receiving member 91, and at least one of the first receiving member 91 and the second receiving member 92 can adjust the relative position of the first receiving member 91 and the second receiving member 92. It has the adjustment part 93.

  According to this configuration, the position of the locking portion 922 with respect to the machine body 2 can be adjusted by adjusting the relative position of the first receiving member 91 and the second receiving member 92. As a result, the position of the locking portion 922 with respect to the locking piece 80 provided on the bonnet 43 can be adjusted, and the engagement margin of the locking piece 80 with respect to the locking portion 922 can be adjusted. Therefore, the locking piece 80 provided on the bonnet 43 can be reliably locked to the locking portion 922 of the receiving member 90 provided on the machine body 2. As a result, problems caused by dimensional errors and assembly errors of the bonnet 43, the receiving member 90, etc. (problems such as the hood 43 being unable to be closed in the production line, the bonnet 43 being opened by vibration during use) are prevented. Can do.

  The first receiving member 91 and the second receiving member 92 are connected to each other. The first receiving member 91 has a first hole 91a, and the second receiving member 92 has a second hole 92a. The connection member 94 has an insertion portion 94d inserted into the first hole 91a and the second hole 92a, and the adjustment portion 93 includes at least one of the first hole 91a and the second hole 92a. The hole is formed in a size having a play gap CL3 with respect to the outer diameter of the insertion portion 94d.

According to this configuration, the first receiving member 91 and the second receiving member 92 are connected by the connecting member 94, and the relative position between the first receiving member 91 and the second receiving member 92 is adjusted using the play gap CL3. Can be possible.
Further, the play gap CL3 allows the second receiving member 92 to move with respect to the first receiving member 91 in the vertical direction and the front-rear direction.

According to this structure, the freedom degree of adjustment of the position of the latching | locking part 922 with respect to the latching piece 80 becomes high. Therefore, inconvenience caused by dimensional errors and assembly errors of the bonnet 43 and the receiving member 90 can be more reliably prevented.
In addition, at least one of the first receiving member 91 and the machine body 2 includes a second adjustment unit that can adjust the relative position of the first receiving member 91 and the machine body 2.

According to this configuration, in addition to the adjustment of the relative position between the first receiving member 91 and the second receiving member 92, the relative position between the machine body 2 and the first receiving member 91 can be adjusted. Therefore, the position of the locking portion 922 with respect to the locking piece 80 can be adjusted in the vertical direction, the front-rear direction, and the left-right direction.
The second receiving member 92 has a slit 923 cut from the bonnet 43 side toward the machine body 2 side, and the bonnet 43 is disposed so that one surface faces upward and the other surface faces downward. In addition, an insertion plate 95 that is inserted into the slit 923 when the hood 43 is closed is provided.

  According to this configuration, vibration of the bonnet 43 can be suppressed by restricting the movement of the insertion plate 95 by the slit 923 with the bonnet 43 closed. Further, when the bonnet 43 is closed, the insertion plate 95 provided on the bonnet 43 is inserted into the slit 923 of the second receiving member 92, whereby the bonnet 43 is accurately positioned with respect to the receiving member 90. Therefore, the locking piece 80 can be securely locked to the locking portion 922. In addition, since the insertion plate 95 arranged so that one surface faces upward and the other surface faces downward is configured to be inserted into the slit 923, the second receiving member 92 and the insertion plate 95 are compact in the vertical direction. Thus, the interference with other members can be prevented.

The adjustment portion 93 includes an upper adjustment portion 93 </ b> A provided at the upper portion of the first receiving member 91 and a lower adjustment portion 93 </ b> B provided at the lower portion of the first receiving member 91, and the locking portion 922. The slit 923 is provided between the upper adjustment portion 93A and the lower adjustment portion 93B.
According to this configuration, the position of the second receiving member 92 with respect to the first receiving member 91 can be reliably adjusted with high accuracy by the two adjusting portions of the upper adjusting portion 93A and the lower adjusting portion 93B. Further, since the locking portion 922 and the slit 923 are provided between the two adjustment portions, the position of the locking portion 922 can be accurately adjusted.

Further, the locking portion 922 has a recess 924 cut out from the bonnet 43 side toward the machine body 2 side, and a columnar locking shaft 925 extending in the vertical direction on the bonnet 43 side of the recess 924, The locking piece 80 includes a hook that is locked to the locking shaft 925.
According to this configuration, the hooks constituting the locking piece 80 are inserted into the space formed between the recess 924 and the locking shaft 925, so that the locking piece 80 can be securely attached to the locking shaft 925. And it can be easily locked. In addition, since the locking shaft 925 has a cylindrical shape, even when the locking piece 80 is repeatedly locked and detached from the locking shaft 925, the locking shaft 915 is less likely to be worn, and reliable over a long period of time. Locking becomes possible.

In addition, a vertical axis 79 that rotatably supports the locking piece 80 is provided, the second receiving member 92 extends from the body 2 side toward the bonnet 43 side, and the locking shaft 925 and the vertical axis 79 are When the bonnet 43 is closed, they are arranged side by side in a direction (front-rear direction) parallel to the extending direction of the second receiving member 92.
According to this configuration, the locking piece 80 can be locked to the locking shaft 925 easily and easily. Specifically, in FIG. 28, when the vertical axis 79 is shifted to the right (above the one-dot chain line L) with respect to the locking shaft 925, the locking piece 80 is easily hooked with respect to the locking shaft 925, but is easily detached. . When the vertical axis 79 is shifted to the left with respect to the locking shaft 925 (below the alternate long and short dash line L), the locking piece 80 is unlikely to be detached from the locking shaft 925 but is not easily caught. According to the present embodiment, the locking shaft 925 and the vertical axis 79 are arranged in an appropriate positional relationship, so that the locking is easy to be caught and difficult to come off.

  The belt tension adjusting device 100 includes a driving pulley 101 attached to a power transmission shaft (output shaft 13a), a driven pulley 105 provided in a driven device (compressor 25), a tension pulley 106, and a driving pulley 101 and a driven pulley. An endless belt (second belt) 107 that spans between the pulley 105 and the tension pulley 106 and transmits the rotational driving force of the power transmission shaft to the driven device, and tension adjustment that adjusts the tension of the belt The tension adjusting mechanism is connected to the support shaft 108 that is rotatably supported, the rotation operation mechanism 130 that rotates the support shaft 108 about the axis thereof, the support shaft 108 and the tension pulley 106. Along with the rotation of the support shaft 108, the tension pulley 106 is driven against the driving pulley 101 and the driven pulley 105. It includes a rotating member 120 for changing the relative position.

  According to this configuration, the tension of the belt (second belt) 107 can be adjusted without moving the driven device (compressor 25). Therefore, when the belt tension is adjusted, it is possible to prevent the wiring connected to the driven device from moving and interfering with other members. Further, it is not necessary to secure a space for moving the driven device. Further, since there is no need to move the device 25, the tension of the second belt 107 can be adjusted with a small force. Further, since the force (torsional force) generated when the rotation member 120 is rotated can be received by the rotation of the support shaft 108, deformation and breakage due to the torsional force hardly occur.

The rotation operation mechanism 130 regulates the movable member 131 attached to the support shaft 108, the operation unit 132 that rotates the support shaft 108 by rotating the movable member 131, and the rotation range of the movable member 132. And a regulation mechanism.
According to this configuration, since the support shaft 108 can be rotated by rotating the movable member 131 by the operation unit 132, an operation for adjusting the tension of the second belt 107 is easy. Moreover, since the rotation range of the movable member 132 is regulated by the regulation mechanism, the tension of the second belt 107 can be adjusted within an appropriate range.

  In addition, a bracket 110 having a fixed portion 116 fixed to the driven device and a support portion 117 that rotatably supports the support shaft 108 is provided, and the restricting mechanism includes a support shaft 108 formed on the movable member 131. An arcuate guide hole 131a at the center and an insertion portion 118 provided in the bracket 110 and inserted into the guide hole 131a and whose position is changed in the guide hole 131a as the movable member 131 rotates. doing.

According to this configuration, the direction and range of movement of the movable member 131 relative to the bracket 110 can be accurately and reliably regulated by the guide hole 131a and the insertion portion 118. Thereby, the movable member 131 can be smoothly and accurately rotated with the rotation of the support shaft 108.
Further, the support shaft 108 is parallel to the rotation shaft of the tension pulley 106, one end side is disposed on the tension pulley 106 side, the other end side is disposed on the opposite side to the tension pulley 106 side, and the operation unit 132 is provided with the support shaft 132. 108 is provided on the other end side.

According to this configuration, since the operation unit 132 is disposed on the other end side (the side opposite to the tension pulley 106 side) of the support shaft 108, other devices (such as the radiator 46) disposed on the tension pulley 106 side can be used. It does not hinder the operation of the operation unit 132, and the operability of the operation unit 132 is excellent.
In addition, the operation unit 132 includes a first fixing member 133 fixed to the movable member 131, a second fixing member 134 fixed to the bracket 110, and a distance between the first fixing member 133 and the second fixing member 134. And an adjustment mechanism 135 that can adjust the angle.

  According to this configuration, by adjusting the distance between the first fixing member 133 and the second fixing member 134 by the adjusting mechanism 135, the portion fixed to the first fixing member 133 of the movable member 131 and the bracket 110. The distance from the portion where the second fixing member 134 is fixed can be changed. Thereby, the linear motion (adjustment of the distance between the first fixed member 133 and the second fixed member 134) by the adjustment mechanism 135 can be converted into the rotational motion of the movable member 131 relative to the bracket 110.

The adjustment mechanism 135 includes a male screw member 135a having one end fixed to the first fixing member 133 and the other end inserted through the second fixing member 134, and a second screw contacting the second fixing member 134 on the other end. A female screw member 135b screwed to 135a.
According to this configuration, by rotating the female screw member 135b, the male screw member 135a can be advanced and retracted relative to the female screw member 135b. Thereby, adjustment of the distance between the 1st fixing member 133 and the 2nd fixing member 134 can be performed easily. That is, the movable member 131 can be rotated with respect to the bracket 110 by a simple operation of rotating the female screw member 135b.

  As mentioned above, although this invention was demonstrated, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Work implement 2 Machine body 43 Bonnet 79 Vertical axis | shaft 80 Locking piece 90 Receiving member 91 1st receiving member 91a 1st hole 92 2nd receiving member 92a 2nd hole 922 Locking part 923 Slit 924 Recessed part 925 Locking shaft 93 Adjustment part 93A Upper adjustment part 93B Lower adjustment part 94 Connection member 94d Insertion part 95 Insertion plate CL3 Play gap

Claims (8)

The aircraft,
A bonnet that can be opened and closed with respect to the aircraft;
A locking piece provided on the bonnet;
A receiving member provided on the airframe and having a locking portion to which the locking piece is locked when the bonnet is closed;
With
The receiving member includes a first receiving member fixed to the body, and a second receiving member having the locking portion and connected to the first receiving member,
A working machine in which at least one of the first receiving member and the second receiving member has an adjustment unit that can adjust a relative position between the first receiving member and the second receiving member. A connection member connecting the first receiving member and the second receiving member;
A first hole is formed in the first receiving member,
A second hole is formed in the second receiving member,
The connection member has an insertion portion to be inserted into the first hole and the second hole,
The adjustment part includes at least one of the first hole and the second hole, and the hole is formed to have a play gap with respect to an outer diameter of the insertion part. The working machine described in.   The work machine according to claim 2, wherein the play gap allows movement of the second receiving member relative to the first receiving member in a vertical direction and a front-rear direction.   4. The device according to claim 1, wherein at least one of the first receiving member and the airframe includes a second adjustment unit that allows adjustment of a relative position between the first receiving member and the airframe. Working machine. The second receiving member has a slit cut from the bonnet side toward the body side,
The said bonnet is arrange | positioned so that one surface may face upward and the other surface may face downward, and the insertion board inserted in the said slit when a bonnet is closed is provided. The working machine according to claim 1.   The said adjustment part contains the upper side adjustment part provided above the said latching | locking part, and the lower side adjustment part provided below the said latching | locking part. Working machine. The locking portion has a recess cut out from the bonnet side toward the machine body side, and a columnar locking shaft extending in the vertical direction on the bonnet side of the recess,
The work machine according to any one of claims 1 to 6, wherein the locking piece includes a hook that is locked to the locking shaft. A vertical axis for rotatably supporting the locking piece;
The second receiving member extends from the body side toward the bonnet side,
The work machine according to claim 7, wherein the vertical axis and the locking shaft are arranged side by side in a direction parallel to an extending direction of the second receiving member when the bonnet is closed.

Images